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class="pagination-link " aria-label="Page 5" aria-current="page">5 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.11811">arXiv:2501.11811</a> <span> [<a href="https://arxiv.org/pdf/2501.11811">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Universal programmable and self-configuring optical filter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Miller%2C+D+A+B">David A. B. Miller</a>, <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Valdez%2C+C+G">Carson G. Valdez</a>, <a href="/search/physics?searchtype=author&query=Kroo%2C+A+R">Anne R. Kroo</a>, <a href="/search/physics?searchtype=author&query=Vlk%2C+M">Marek Vlk</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Solgaard%2C+O">Olav Solgaard</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.11811v2-abstract-short" style="display: inline;"> We propose an approach to integrated optical spectral filtering that allows arbitrary programmability, can compensate automatically for imperfections in filter fabrication, allows multiple simultaneous and separately programmable filter functions on the same input, and can configure itself automatically to the problem of interest, for example to filter or reject multiple arbitrarily chosen frequen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.11811v2-abstract-full').style.display = 'inline'; document.getElementById('2501.11811v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.11811v2-abstract-full" style="display: none;"> We propose an approach to integrated optical spectral filtering that allows arbitrary programmability, can compensate automatically for imperfections in filter fabrication, allows multiple simultaneous and separately programmable filter functions on the same input, and can configure itself automatically to the problem of interest, for example to filter or reject multiple arbitrarily chosen frequencies. The approach exploits splitting the input light into an array of multiple waveguides of different lengths that then feed a programmable interferometer array that can also self-configure. It can give spectral response similar to arrayed waveguide gratings but offers many other filtering functions, as well as supporting other structures based on non-redundant arrays for precise spectral filtering. Simultaneous filtering also allows, for the first time to our knowledge, an automatic measurement of the temporal coherency matrix and physical separation into the Karhunen-Lo猫ve expansion of temporally partially coherent light fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.11811v2-abstract-full').style.display = 'none'; document.getElementById('2501.11811v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.10577">arXiv:2501.10577</a> <span> [<a href="https://arxiv.org/pdf/2501.10577">pdf</a>, <a href="https://arxiv.org/format/2501.10577">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Spatiotemporal steering of non-diffracting wavepackets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haiwen Wang</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.10577v1-abstract-short" style="display: inline;"> We study the dynamics of space-time non-diffracting wavepackets, commonly known as light bullets, in a spatiotemporally varying medium. We show that by spatiotemporal refraction, a monochromatic focused beam can be converted to a light bullet that propagates at a given velocity. By further designing the index profile of the spatiotemporal boundary, the group velocity and the propagation direction… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.10577v1-abstract-full').style.display = 'inline'; document.getElementById('2501.10577v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.10577v1-abstract-full" style="display: none;"> We study the dynamics of space-time non-diffracting wavepackets, commonly known as light bullets, in a spatiotemporally varying medium. We show that by spatiotemporal refraction, a monochromatic focused beam can be converted to a light bullet that propagates at a given velocity. By further designing the index profile of the spatiotemporal boundary, the group velocity and the propagation direction of the light bullet can be engineered in a programmable way. All effects mentioned above cannot be achieved by spatial or temporal boundaries, and are only possible with spatiotemporal boundaries. These findings provide unique ways to engineer the dynamics of electromagnetic wavepackets in space-time. Such wavepackets with engineered spacetime trajectories may find potential applications in the spatiotemporal control of material properties or particles, or for use as a way to emulate relativistic physics in the laboratory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.10577v1-abstract-full').style.display = 'none'; document.getElementById('2501.10577v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.09376">arXiv:2501.09376</a> <span> [<a href="https://arxiv.org/pdf/2501.09376">pdf</a>, <a href="https://arxiv.org/ps/2501.09376">ps</a>, <a href="https://arxiv.org/format/2501.09376">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Multiple truly topological unidirectional surface magnetoplasmons at terahertz frequencies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shengquan Fan</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+T">Tianjing Guo</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+B">Binbin Zhou</a>, <a href="/search/physics?searchtype=author&query=Xu%2C+J">Jie Xu</a>, <a href="/search/physics?searchtype=author&query=Deng%2C+X">Xiaohua Deng</a>, <a href="/search/physics?searchtype=author&query=Lei%2C+J">Jiangtao Lei</a>, <a href="/search/physics?searchtype=author&query=Shen%2C+Y">Yun Shen</a>, <a href="/search/physics?searchtype=author&query=Fu%2C+M">Meicheng Fu</a>, <a href="/search/physics?searchtype=author&query=Tsakmakidis%2C+K+L">Kosmas L. Tsakmakidis</a>, <a href="/search/physics?searchtype=author&query=Hong%2C+L">Lujun Hong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.09376v1-abstract-short" style="display: inline;"> Unidirectional propagation based on surface magnetoplasmons (SMPs) has recently been realized at the interface of magnetized semiconductors. However, usually SMPs lose their unidirectionality due to non-local effects, especially in the lower trivial bandgap of such structures. More recently, a truly unidirectional SMP (USMP) has been demonstrated in the upper topological non-trivial bandgap, but i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09376v1-abstract-full').style.display = 'inline'; document.getElementById('2501.09376v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.09376v1-abstract-full" style="display: none;"> Unidirectional propagation based on surface magnetoplasmons (SMPs) has recently been realized at the interface of magnetized semiconductors. However, usually SMPs lose their unidirectionality due to non-local effects, especially in the lower trivial bandgap of such structures. More recently, a truly unidirectional SMP (USMP) has been demonstrated in the upper topological non-trivial bandgap, but it supports only a single USMP, limiting its functionality. In this work, we present a fundamental physical model for multiple, robust, truly topological USMP modes at terahertz (THz) frequencies, realized in a semiconductor-dielectric-semiconductor (SDS) slab waveguide under opposing external magnetic fields. We analytically derive the dispersion properties of the SMPs and perform numerical analysis in both local and non-local models. Our results show that the SDS waveguide supports two truly (even and odd) USMP modes in the upper topological non-trivial bandgap. Exploiting these two modes, we demonstrate unidirectional SMP multimode interference (USMMI), being highly robust and immune to backscattering, overcoming the back-reflection issue in conventional bidirectional waveguides. To demonstrate the usefullness of this approach, we numerically realize a frequency- and magnetically-tunable arbitrary-ratio splitter based on this robust USMMI, enabling multimode conversion. We, further, identify a unique index-near-zero (INZ) odd USMP mode in the SDS waveguide, distinct from conventional semiconductor-dielectric-metal waveguides. Leveraging this INZ mode, we achieve phase modulation with a phase shift from -$蟺$ to $蟺$. Our work expands the manipulation of topological waves and enriches the field of truly non-reciprocal topological physics for practical device applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09376v1-abstract-full').style.display = 'none'; document.getElementById('2501.09376v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.07917">arXiv:2501.07917</a> <span> [<a href="https://arxiv.org/pdf/2501.07917">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Roadmap on Neuromorphic Photonics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brunner%2C+D">Daniel Brunner</a>, <a href="/search/physics?searchtype=author&query=Shastri%2C+B+J">Bhavin J. Shastri</a>, <a href="/search/physics?searchtype=author&query=Qadasi%2C+M+A+A">Mohammed A. Al Qadasi</a>, <a href="/search/physics?searchtype=author&query=Ballani%2C+H">H. Ballani</a>, <a href="/search/physics?searchtype=author&query=Barbay%2C+S">Sylvain Barbay</a>, <a href="/search/physics?searchtype=author&query=Biasi%2C+S">Stefano Biasi</a>, <a href="/search/physics?searchtype=author&query=Bienstman%2C+P">Peter Bienstman</a>, <a href="/search/physics?searchtype=author&query=Bilodeau%2C+S">Simon Bilodeau</a>, <a href="/search/physics?searchtype=author&query=Bogaerts%2C+W">Wim Bogaerts</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hm%2C+F">Fabian B枚hm</a>, <a href="/search/physics?searchtype=author&query=Brennan%2C+G">G. Brennan</a>, <a href="/search/physics?searchtype=author&query=Buckley%2C+S">Sonia Buckley</a>, <a href="/search/physics?searchtype=author&query=Cai%2C+X">Xinlun Cai</a>, <a href="/search/physics?searchtype=author&query=Strinati%2C+M+C">Marcello Calvanese Strinati</a>, <a href="/search/physics?searchtype=author&query=Canakci%2C+B">B. Canakci</a>, <a href="/search/physics?searchtype=author&query=Charbonnier%2C+B">Benoit Charbonnier</a>, <a href="/search/physics?searchtype=author&query=Chemnitz%2C+M">Mario Chemnitz</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Y">Yitong Chen</a>, <a href="/search/physics?searchtype=author&query=Cheung%2C+S">Stanley Cheung</a>, <a href="/search/physics?searchtype=author&query=Chiles%2C+J">Jeff Chiles</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+S">Suyeon Choi</a>, <a href="/search/physics?searchtype=author&query=Christodoulides%2C+D+N">Demetrios N. Christodoulides</a>, <a href="/search/physics?searchtype=author&query=Chrostowski%2C+L">Lukas Chrostowski</a>, <a href="/search/physics?searchtype=author&query=Chu%2C+J">J. Chu</a>, <a href="/search/physics?searchtype=author&query=Clegg%2C+J+H">J. H. Clegg</a> , et al. (125 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.07917v2-abstract-short" style="display: inline;"> This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementation philosophies reported in the field. It emphasizes the critical role of cross-disciplinary collaboration in this rapidly evolving field. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.07917v2-abstract-full" style="display: none;"> This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementation philosophies reported in the field. It emphasizes the critical role of cross-disciplinary collaboration in this rapidly evolving field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.07917v2-abstract-full').style.display = 'none'; document.getElementById('2501.07917v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.01550">arXiv:2501.01550</a> <span> [<a href="https://arxiv.org/pdf/2501.01550">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Dynamic realization of emergent high-dimensional optical vortices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kim%2C+D">Dongha Kim</a>, <a href="/search/physics?searchtype=author&query=Park%2C+G">Geonhyeong Park</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+Y">Yun-Seok Choi</a>, <a href="/search/physics?searchtype=author&query=Baucour%2C+A">Arthur Baucour</a>, <a href="/search/physics?searchtype=author&query=Hwang%2C+J">Jisung Hwang</a>, <a href="/search/physics?searchtype=author&query=Park%2C+S">Sanghyeok Park</a>, <a href="/search/physics?searchtype=author&query=Yun%2C+H+S">Hee Seong Yun</a>, <a href="/search/physics?searchtype=author&query=Shin%2C+J">Jonghwa Shin</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haiwen Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Yoon%2C+D+K">Dong Ki Yoon</a>, <a href="/search/physics?searchtype=author&query=Seo%2C+M">Min-Kyo Seo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.01550v1-abstract-short" style="display: inline;"> The dimensionality of vortical structures has recently been extended beyond two dimensions, providing higher-order topological characteristics and robustness for high-capacity information processing and turbulence control. The generation of high-dimensional vortical structures has mostly been demonstrated in classical systems through the complex interference of fluidic, acoustic, or electromagneti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.01550v1-abstract-full').style.display = 'inline'; document.getElementById('2501.01550v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.01550v1-abstract-full" style="display: none;"> The dimensionality of vortical structures has recently been extended beyond two dimensions, providing higher-order topological characteristics and robustness for high-capacity information processing and turbulence control. The generation of high-dimensional vortical structures has mostly been demonstrated in classical systems through the complex interference of fluidic, acoustic, or electromagnetic waves. However, natural materials rarely support three- or higher-dimensional vortical structures and their physical interactions. Here, we present a high-dimensional gradient thickness optical cavity (GTOC) in which the optical coupling of planar metal-dielectric multilayers implements topological interactions across multiple dimensions. Topological interactions in high-dimensional GTOC construct non-trivial topological phases, which induce high-dimensional vortical structures in generalized parameter space in three, four dimensions, and beyond. These emergent high-dimensional vortical structures are observed under electro-optic tomography as optical vortex dynamics in two-dimensional real-space, employing the optical thicknesses of the dielectric layers as synthetic dimensions. We experimentally demonstrate emergent vortical structures, optical vortex lines and vortex rings, in a three-dimensional generalized parameter space and their topological transitions. Furthermore, we explore four-dimensional vortical structures, termed optical vortex sheets, which provide the programmability of real-space optical vortex dynamics. Our findings hold significant promise for emulating high-dimensional physics and developing active topological photonic devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.01550v1-abstract-full').style.display = 'none'; document.getElementById('2501.01550v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages,5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.15068">arXiv:2412.15068</a> <span> [<a href="https://arxiv.org/pdf/2412.15068">pdf</a>, <a href="https://arxiv.org/format/2412.15068">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Cavity Quantum Electrodynamics in Finite-Bandwidth Squeezed Reservoir </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=L%C3%AA%2C+T+K">Trung Ki锚n L锚</a>, <a href="/search/physics?searchtype=author&query=Lukin%2C+D+M">Daniil M. Lukin</a>, <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Karnieli%2C+A">Aviv Karnieli</a>, <a href="/search/physics?searchtype=author&query=Lustig%2C+E">Eran Lustig</a>, <a href="/search/physics?searchtype=author&query=Guidry%2C+M+A">Melissa A. Guidry</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Vu%C4%8Dkovi%C4%87%2C+J">Jelena Vu膷kovi膰</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.15068v1-abstract-short" style="display: inline;"> Light-matter interaction with squeezed vacuum has received much interest for the ability to enhance the native interaction strength between an atom and a photon with a reservoir assumed to have an infinite bandwidth. Here, we study a model of parametrically driven cavity quantum electrodynamics (cavity QED) for enhancing light-matter interaction while subjected to a finite-bandwidth squeezed vacuu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.15068v1-abstract-full').style.display = 'inline'; document.getElementById('2412.15068v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.15068v1-abstract-full" style="display: none;"> Light-matter interaction with squeezed vacuum has received much interest for the ability to enhance the native interaction strength between an atom and a photon with a reservoir assumed to have an infinite bandwidth. Here, we study a model of parametrically driven cavity quantum electrodynamics (cavity QED) for enhancing light-matter interaction while subjected to a finite-bandwidth squeezed vacuum drive. Our method is capable of unveiling the effect of relative bandwidth as well as squeezing required to observe the anticipated anti-crossing spectrum and enhanced cooperativity without the ideal squeezed bath assumption. Furthermore, we analyze the practicality of said models when including intrinsic photon loss due to resonators imperfection. With these results, we outline the requirements for experimentally implementing an effectively squeezed bath in solid-state platforms such as InAs quantum dot cavity QED such that \textit{in situ} control and enhancement of light-matter interaction could be realized. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.15068v1-abstract-full').style.display = 'none'; document.getElementById('2412.15068v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.11263">arXiv:2412.11263</a> <span> [<a href="https://arxiv.org/pdf/2412.11263">pdf</a>, <a href="https://arxiv.org/format/2412.11263">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Twist-Induced Beam Steering and Blazing Effects in Photonic Crystal Devices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Roy%2C+N">Nicolas Roy</a>, <a href="/search/physics?searchtype=author&query=Lou%2C+B">Beicheng Lou</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Mayer%2C+A">Alexandre Mayer</a>, <a href="/search/physics?searchtype=author&query=Lobet%2C+M">Micha毛l Lobet</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.11263v1-abstract-short" style="display: inline;"> Twisted bilayer photonic crystals introduce a twist between two stacked photonic crystal slabs, enabling strong modulation of their electromagnetic properties. The change in the twist angle strongly influences the resonant frequencies and available propagating diffraction orders with applications including sensing, lasing, slow light or wavefront engineering. In this work, we design and analyze tw… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.11263v1-abstract-full').style.display = 'inline'; document.getElementById('2412.11263v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.11263v1-abstract-full" style="display: none;"> Twisted bilayer photonic crystals introduce a twist between two stacked photonic crystal slabs, enabling strong modulation of their electromagnetic properties. The change in the twist angle strongly influences the resonant frequencies and available propagating diffraction orders with applications including sensing, lasing, slow light or wavefront engineering. In this work, we design and analyze twisted bilayer crystals capable of steering light in a direction controlled by the twist angle. In order to achieve beam steering, the device efficiently routes input power into a single, twist-dependent, transmitted diffraction order. The outgoing light then follows the orientation of this diffraction order, externally controlled by the twist angle. The optimization is performed using high-efficiency heuristic optimization method which enabled a data-oriented approach to further understand the design operation. The optimized device demonstrates an efficiency above 90% across twist angles ranging from 0 to 30 degrees for both TE and TM polarizations. Extending the optimization to include left- and right-handed polarizations yields overall accuracy nearing 90% when averaged across the entire 0 to 60 degrees control range. Finally, we show how the device resembles blazed gratings by effectively canceling the undesired diffraction orders. The optimized devices exhibit a shared slant dependent on the selected diffraction order. Our analysis is supported by a structural blazing model arising from the data-oriented statistical analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.11263v1-abstract-full').style.display = 'none'; document.getElementById('2412.11263v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.05699">arXiv:2412.05699</a> <span> [<a href="https://arxiv.org/pdf/2412.05699">pdf</a>, <a href="https://arxiv.org/format/2412.05699">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Multifunctional passive metacrystals for enhancing wireless communications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Asgari%2C+M+M">Mohammad M. Asgari</a>, <a href="/search/physics?searchtype=author&query=Catrysse%2C+P+B">Peter B. Catrysse</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haiwen Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Asadchy%2C+V">Viktar Asadchy</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.05699v1-abstract-short" style="display: inline;"> Intelligent surfaces have emerged as a promising solution to enhance coverage and mitigate signal fading in future wireless communication systems, thereby improving bandwidth and data rates. Passive intelligent surfaces, in particular, demonstrate significant potential for reducing both energy consumption and operational costs. However, their current functionalities are typically constrained to op… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05699v1-abstract-full').style.display = 'inline'; document.getElementById('2412.05699v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.05699v1-abstract-full" style="display: none;"> Intelligent surfaces have emerged as a promising solution to enhance coverage and mitigate signal fading in future wireless communication systems, thereby improving bandwidth and data rates. Passive intelligent surfaces, in particular, demonstrate significant potential for reducing both energy consumption and operational costs. However, their current functionalities are typically constrained to operation within a single polarization, frequency band, and angle of arrival, limiting their applicability in realistic scenarios. In this work, we introduce volumetric dielectric composites, referred to as metacrystals, which are designed through computer optimization to greatly extend the capabilities of intelligent surfaces. Owing to their three-dimensional geometry, which supports a large number of degrees of freedom, metacrystals can simultaneously provide complex multiplexing responses for multiple signals. Each signal can be characterized by distinct parameters, including polarization, angle of incidence, frequency, and/or orbital angular momentum. The proposed metacrystals feature binarized permittivity contrast between low-permittivity materials and air gaps, and can thus be fabricated using filament-based additive manufacturing, supporting frequencies up to 100 GHz. By being cost-effective and scalable, these structures are well-suited for industrial applications, such as integration into building walls, where they can redirect or absorb signals in both indoor and outdoor environments with high versatility at millimeter-wave frequencies and beyond. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05699v1-abstract-full').style.display = 'none'; document.getElementById('2412.05699v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.09019">arXiv:2411.09019</a> <span> [<a href="https://arxiv.org/pdf/2411.09019">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum Nanophotonics with Energetic Particles:X-rays and Free Electrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shi%2C+X">Xihang Shi</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+W+W">Wen Wei Lee</a>, <a href="/search/physics?searchtype=author&query=Karnieli%2C+A">Aviv Karnieli</a>, <a href="/search/physics?searchtype=author&query=Lohse%2C+L+M">Leon Merten Lohse</a>, <a href="/search/physics?searchtype=author&query=Gorlach%2C+A">Alexey Gorlach</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+L+W+W">Lee Wei Wesley Wong</a>, <a href="/search/physics?searchtype=author&query=Saldit%2C+T">Tim Saldit</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Kaminer%2C+I">Ido Kaminer</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+L+J">Liang Jie Wong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.09019v1-abstract-short" style="display: inline;"> Rapid progress in precision nanofabrication and atomic design over the past 50 years has ushered in a succession of transformative eras for molding the generation and flow of light. The use of nanoscale and atomic features to design light sources and optical elements-encapsulated by the term nanophotonics-has led to new fundamental science and innovative technologies across the entire electromagne… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09019v1-abstract-full').style.display = 'inline'; document.getElementById('2411.09019v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.09019v1-abstract-full" style="display: none;"> Rapid progress in precision nanofabrication and atomic design over the past 50 years has ushered in a succession of transformative eras for molding the generation and flow of light. The use of nanoscale and atomic features to design light sources and optical elements-encapsulated by the term nanophotonics-has led to new fundamental science and innovative technologies across the entire electromagnetic spectrum, with substantial emphasis on the microwave to visible regimes. In this review, we pay special attention to the impact and potential of nanophotonics in a relatively exotic yet technologically disruptive regime: high-energy particles such as X-ray photons and free electrons-where nanostructures and atomic design open the doors to unprecedented technologies in quantum science and versatile X-ray sources and optics. As the practical generation of X-rays is intrinsically linked to the existence of energetic free or quasi-free-electrons, our review will also capture related phenomena and technologies that combine free electrons with nanophotonics, including free-electron-driven nanophotonics at other photon energies. In particular, we delve into the demonstration and study of quantum recoil in the X-ray regime, the study of nanomaterial design and free-electron wave shaping as means to enhance and control X-ray radiation, examine the free-electron generation enabled by nanophotonics, and analyze the high-harmonic generation by quasi-free electrons. We also discuss applications of quantum nanophotonics for X-rays and free electrons, including nanostructure waveguides for X-rays, photon pair enhanced X-ray imaging, mirrors, and lenses for X-rays, among others. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09019v1-abstract-full').style.display = 'none'; document.getElementById('2411.09019v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.21420">arXiv:2410.21420</a> <span> [<a href="https://arxiv.org/pdf/2410.21420">pdf</a>, <a href="https://arxiv.org/format/2410.21420">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Near-field dynamical Casimir effect </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yu%2C+R">Renwen Yu</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.21420v1-abstract-short" style="display: inline;"> We propose the dynamical Casimir effect in a time-modulated near-field system. The system consists of two bodies made of polaritonic materials, that are brought in close proximity to each other, and the modulation frequency is approximately twice the relevant resonance frequencies of the system. We develop a rigorous fluctuational electrodynamics formalism to explore the produced Casimir flux, ass… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.21420v1-abstract-full').style.display = 'inline'; document.getElementById('2410.21420v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.21420v1-abstract-full" style="display: none;"> We propose the dynamical Casimir effect in a time-modulated near-field system. The system consists of two bodies made of polaritonic materials, that are brought in close proximity to each other, and the modulation frequency is approximately twice the relevant resonance frequencies of the system. We develop a rigorous fluctuational electrodynamics formalism to explore the produced Casimir flux, associated with the degenerate as well as non-degenerate two-polariton emission processes. We have identified flux contributions from both quantum and thermal fluctuations at finite temperatures, with a dominant quantum contribution even at room temperature under the presence of a strong near-field effect. We have conducted a nonclassicality test for the total radiative flux at finite temperatures, and shown that nonclasscical states of emitted photons can be obtained for a high temperature up to $\sim 250\,$K. Our findings open an avenue for the exploration of dynamical Casimir effect beyond cryogenic temperatures, and may be useful for creating tunable nanoscale nonclassical light sources. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.21420v1-abstract-full').style.display = 'none'; document.getElementById('2410.21420v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.08543">arXiv:2410.08543</a> <span> [<a href="https://arxiv.org/pdf/2410.08543">pdf</a>, <a href="https://arxiv.org/format/2410.08543">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> End-to-end design of multicolor scintillators for enhanced energy resolution in X-ray imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Min%2C+S">Seokhwan Min</a>, <a href="/search/physics?searchtype=author&query=Choi%2C+S">Seou Choi</a>, <a href="/search/physics?searchtype=author&query=Pajovic%2C+S">Simo Pajovic</a>, <a href="/search/physics?searchtype=author&query=Vaidya%2C+S">Sachin Vaidya</a>, <a href="/search/physics?searchtype=author&query=Rivera%2C+N">Nicholas Rivera</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Solja%C4%8Di%C4%87%2C+M">Marin Solja膷i膰</a>, <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.08543v1-abstract-short" style="display: inline;"> Scintillators have been widely used in X-ray imaging due to their ability to convert high-energy radiation into visible light, making them essential for applications such as medical imaging and high-energy physics. Recent advances in the artificial structuring of scintillators offer new opportunities for improving the energy resolution of scintillator-based X-ray detectors. Here, we present a thre… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.08543v1-abstract-full').style.display = 'inline'; document.getElementById('2410.08543v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.08543v1-abstract-full" style="display: none;"> Scintillators have been widely used in X-ray imaging due to their ability to convert high-energy radiation into visible light, making them essential for applications such as medical imaging and high-energy physics. Recent advances in the artificial structuring of scintillators offer new opportunities for improving the energy resolution of scintillator-based X-ray detectors. Here, we present a three-bin energy-resolved X-ray imaging framework based on a three-layer multicolor scintillator used in conjunction with a physics-aware image postprocessing algorithm. The multicolor scintillator is able to preserve X-ray energy information through the combination of emission wavelength multiplexing and energy-dependent isolation of X-ray absorption in specific layers. The dominant emission color and the radius of the spot measured by the detector are used to infer the incident X-ray energy based on prior knowledge of the energy-dependent absorption profiles of the scintillator stack. Through ab initio Monte Carlo simulations, we show that our approach can achieve an energy reconstruction accuracy of 49.7%, which is only 2% below the maximum accuracy achievable with realistic scintillators. We apply our framework to medical phantom imaging simulations where we demonstrate that it can effectively differentiate iodine and gadolinium-based contrast agents from bone, muscle, and soft tissue. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.08543v1-abstract-full').style.display = 'none'; document.getElementById('2410.08543v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.07341">arXiv:2410.07341</a> <span> [<a href="https://arxiv.org/pdf/2410.07341">pdf</a>, <a href="https://arxiv.org/format/2410.07341">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Control of chirality and directionality of nonlinear metasurface light source via twisting </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhou%2C+H">Huanyu Zhou</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+X">Xueqi Ni</a>, <a href="/search/physics?searchtype=author&query=Lou%2C+B">Beicheng Lou</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+Y">Yuan Cao</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+H">Haoning Tang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.07341v1-abstract-short" style="display: inline;"> Metasurfaces have revolutionized nonlinear and quantum light manipulation in the past decade, enabling the design of materials that can tune polarization, frequency, and direction of light simultaneously. However, tuning of metasurfaces is traditionally achieved by changing their microscopic structure, which does not allow \emph{in situ} tuning and dynamic optimization of the metasurfaces. In this… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.07341v1-abstract-full').style.display = 'inline'; document.getElementById('2410.07341v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.07341v1-abstract-full" style="display: none;"> Metasurfaces have revolutionized nonlinear and quantum light manipulation in the past decade, enabling the design of materials that can tune polarization, frequency, and direction of light simultaneously. However, tuning of metasurfaces is traditionally achieved by changing their microscopic structure, which does not allow \emph{in situ} tuning and dynamic optimization of the metasurfaces. In this Letter, we explore the concept of twisted bilayer and tetralayer nonlinear metasurfaces, which offer rich tunability in its effective nonlinear susceptibilities. Using gold-based metasurfaces, we demonstrate that a number of different singularities of nonlinear susceptibilities can exist in the parameter space of twist angle and interlayer gap between different twisted layers. At the singularities, reflected/transmitted light from the nonlinear process (such as second-harmonic generation) can either become circularly polarized (for C points), or entirely vanish (for V points). By further breaking symmetries of the system, we can independently tune all aspects of the reflected and transmitted nonlinear emission, achieving unidirectional emission with full-Poincar茅 polarization tunability, a dark state (V-V point), or any other bidirectional output. Our work paves the way for multidimensional control of polarization and directionality in nonlinear light sources, opening new avenues in ultrafast optics, optical communication, sensing, and quantum optics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.07341v1-abstract-full').style.display = 'none'; document.getElementById('2410.07341v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.04565">arXiv:2410.04565</a> <span> [<a href="https://arxiv.org/pdf/2410.04565">pdf</a>, <a href="https://arxiv.org/format/2410.04565">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> </div> </div> <p class="title is-5 mathjax"> Passivity constraints on the relations between transmission, reflection, and absorption eigenvalues </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.04565v1-abstract-short" style="display: inline;"> We investigate the passivity constraints on the relations between transmission, reflection, and absorption eigenvalues in linear time-invariant systems. Using techniques from matrix analysis, we derive necessary and sufficient conditions for the permissible combinations of these eigenvalues. Our analysis reveals that the set of allowable eigenvalue combinations forms a convex polyhedron in eigenva… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.04565v1-abstract-full').style.display = 'inline'; document.getElementById('2410.04565v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.04565v1-abstract-full" style="display: none;"> We investigate the passivity constraints on the relations between transmission, reflection, and absorption eigenvalues in linear time-invariant systems. Using techniques from matrix analysis, we derive necessary and sufficient conditions for the permissible combinations of these eigenvalues. Our analysis reveals that the set of allowable eigenvalue combinations forms a convex polyhedron in eigenvalue space, characterized by a trace equality and a set of linear inequalities. Surprisingly, we uncover a direct connection between this physical problem and Alfred Horn's inequalities, a fundamental result in matrix theory. We provide explicit examples for systems with varying numbers of input ports, demonstrating the increasing complexity of the constraints as system size grows. We apply our theory to analyze the implications of important phenomena, including open and closed channels, coherent perfect reflection and reflectionless scattering modes, and coherent perfect absorption and coherent zero absorption. Our findings not only offer a complete characterization of passivity constraints on wave transport eigenvalues but also establish an unexpected bridge between fundamental wave physics and advanced matrix theory, opening new avenues for research at their intersection. These results have significant implications for the design and optimization of passive wave devices across a wide range of applications in optics, acoustics, and mesoscopic physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.04565v1-abstract-full').style.display = 'none'; document.getElementById('2410.04565v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">37 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.17002">arXiv:2409.17002</a> <span> [<a href="https://arxiv.org/pdf/2409.17002">pdf</a>, <a href="https://arxiv.org/format/2409.17002">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> </div> <p class="title is-5 mathjax"> Nonreciprocal scintillation using one-dimensional magneto-optical photonic crystals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Long%2C+O+Y">Olivia Y. Long</a>, <a href="/search/physics?searchtype=author&query=Pajovic%2C+S">Simo Pajovic</a>, <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Tsurimaki%2C+Y">Yoichiro Tsurimaki</a>, <a href="/search/physics?searchtype=author&query=Rivera%2C+N">Nicholas Rivera</a>, <a href="/search/physics?searchtype=author&query=Solja%C4%8Di%C4%87%2C+M">Marin Solja膷i膰</a>, <a href="/search/physics?searchtype=author&query=Boriskina%2C+S+V">Svetlana V. Boriskina</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.17002v1-abstract-short" style="display: inline;"> Scintillation describes the conversion of high-energy particles into light in transparent media and finds diverse applications such as high-energy particle detection and industrial and medical imaging. This process operates on multiple timescales, with the final radiative step consisting of spontaneous emission, which can be modeled within the framework of quasi-equilibrium fluctuational electrody… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.17002v1-abstract-full').style.display = 'inline'; document.getElementById('2409.17002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.17002v1-abstract-full" style="display: none;"> Scintillation describes the conversion of high-energy particles into light in transparent media and finds diverse applications such as high-energy particle detection and industrial and medical imaging. This process operates on multiple timescales, with the final radiative step consisting of spontaneous emission, which can be modeled within the framework of quasi-equilibrium fluctuational electrodynamics. Scintillation can therefore be controlled and enhanced via nanophotonic effects, which has been proposed and experimentally demonstrated. Such designs have thus far obeyed Lorentz reciprocity, meaning there is a direct equivalence between scintillation emission and absorption by the scintillator. However, scintillators that do not obey Lorentz reciprocity have not been explored, even though they represent a novel platform for probing emission which is both nonequilibrium and nonreciprocal in nature. In this work, we propose to harness nonreciprocity to achieve directional control of scintillation emission, granting an additional degree of control over scintillation. Such directionality of light output is important in improving collection efficiencies along the directions where detectors are located. We present the design of a nonreciprocal scintillator using a one-dimensional magnetophotonic crystal in the Voigt configuration. Our work demonstrates the potential of controlling nonequilibrium emission such as scintillation by breaking reciprocity and expands the space of nanophotonic design for achieving such control. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.17002v1-abstract-full').style.display = 'none'; document.getElementById('2409.17002v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.10454">arXiv:2409.10454</a> <span> [<a href="https://arxiv.org/pdf/2409.10454">pdf</a>, <a href="https://arxiv.org/format/2409.10454">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Shaping space-time wavepackets beyond the paraxial limit using a dispersion magnifier </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kim%2C+D">Dongha Kim</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Catrysse%2C+P+B">Peter B. Catrysse</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.10454v2-abstract-short" style="display: inline;"> Space-time wavepackets (STWPs) have received significant attention since they can propagate in free space at arbitrary group velocity without dispersion and diffraction. However, at present, the generation of STWPs has been limited to the paraxial regime. Here we show that conventional optical elements can be used to extend STWPs beyond the paraxial regime. A dispersion magnifier, consisting of tw… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.10454v2-abstract-full').style.display = 'inline'; document.getElementById('2409.10454v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.10454v2-abstract-full" style="display: none;"> Space-time wavepackets (STWPs) have received significant attention since they can propagate in free space at arbitrary group velocity without dispersion and diffraction. However, at present, the generation of STWPs has been limited to the paraxial regime. Here we show that conventional optical elements can be used to extend STWPs beyond the paraxial regime. A dispersion magnifier, consisting of two lenses and a beam expander, applies spatiotemporal shaping to paraxial STWPs to create nonparaxial STWPs. The control of the magnification ratio results in versatile engineering capabilities on group velocity, beam diameter, and propagation distance. As an example, we numerically demonstrated long-distance propagation or slow group velocity of the output wavepacket with subwavelength cross-sections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.10454v2-abstract-full').style.display = 'none'; document.getElementById('2409.10454v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.06386">arXiv:2408.06386</a> <span> [<a href="https://arxiv.org/pdf/2408.06386">pdf</a>, <a href="https://arxiv.org/format/2408.06386">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Transport measurements of majorization order for wave coherence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+A+B">David A. B. Miller</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.06386v1-abstract-short" style="display: inline;"> We investigate the majorization order for comparing wave coherence and reveal its fundamental consequences in transport measurements, including power distribution, absorption, transmission, and reflection. We prove that all these measurements preserve the majorization order under unitary control, enabling direct experimental characterization of the majorization order. Specifically, waves with lowe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.06386v1-abstract-full').style.display = 'inline'; document.getElementById('2408.06386v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.06386v1-abstract-full" style="display: none;"> We investigate the majorization order for comparing wave coherence and reveal its fundamental consequences in transport measurements, including power distribution, absorption, transmission, and reflection. We prove that all these measurements preserve the majorization order under unitary control, enabling direct experimental characterization of the majorization order. Specifically, waves with lower coherence in the majorization order exhibit more restricted ranges of achievable measurement values. Our results deepen the understanding of coherence in transport phenomena. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.06386v1-abstract-full').style.display = 'none'; document.getElementById('2408.06386v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.05642">arXiv:2408.05642</a> <span> [<a href="https://arxiv.org/pdf/2408.05642">pdf</a>, <a href="https://arxiv.org/format/2408.05642">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.110.035431">10.1103/PhysRevB.110.035431 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unitary control of partially coherent waves. II. Transmission or reflection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.05642v1-abstract-short" style="display: inline;"> Coherent control of wave transmission and reflection is crucial for applications in communication, imaging, and sensing. However, many practical scenarios involve partially coherent waves rather than fully coherent ones. We present a systematic theory for the unitary control of partially coherent wave transmission and reflection. For a linear time-invariant system with an incident partially cohere… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05642v1-abstract-full').style.display = 'inline'; document.getElementById('2408.05642v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.05642v1-abstract-full" style="display: none;"> Coherent control of wave transmission and reflection is crucial for applications in communication, imaging, and sensing. However, many practical scenarios involve partially coherent waves rather than fully coherent ones. We present a systematic theory for the unitary control of partially coherent wave transmission and reflection. For a linear time-invariant system with an incident partially coherent wave, we derive analytical expressions for the range of attainable total transmittance and reflectance under arbitrary unitary transformations. We also introduce an explicit algorithm to construct a unitary control scheme that achieves any desired transmission or reflection within the attainable range. As applications of our theory, we establish conditions for four novel phenomena: partially coherent perfect transmission, partially coherent perfect reflection, partially coherent zero transmission, and partially coherent zero reflection. We also prove a theorem that relates the degree of coherence of the incident field, quantified by the majorization order, to the resulting transmission and reflection intervals. Furthermore, we demonstrate that reciprocity (or energy conservation) imposes direct symmetry constraints on bilateral transmission (or transmission and reflection) of partially coherent waves under unitary control. Our results provide fundamental insights and practical guidelines for using unitary control to manipulate the transmission and reflection of partially coherent waves. This theory applies to various wave systems, including electromagnetic and acoustic waves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05642v1-abstract-full').style.display = 'none'; document.getElementById('2408.05642v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">31 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 110, 035431 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.05637">arXiv:2408.05637</a> <span> [<a href="https://arxiv.org/pdf/2408.05637">pdf</a>, <a href="https://arxiv.org/format/2408.05637">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.110.035430">10.1103/PhysRevB.110.035430 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unitary control of partially coherent waves. I. Absorption </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.05637v1-abstract-short" style="display: inline;"> The coherent control of wave absorption has important applications in areas such as energy harvesting, imaging, and sensing. However, most practical scenarios involve the absorption of partially coherent rather than fully coherent waves. Here we present a systematic theory of unitary control over the absorption of partially coherent waves by linear systems. Given an absorbing system and incident p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05637v1-abstract-full').style.display = 'inline'; document.getElementById('2408.05637v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.05637v1-abstract-full" style="display: none;"> The coherent control of wave absorption has important applications in areas such as energy harvesting, imaging, and sensing. However, most practical scenarios involve the absorption of partially coherent rather than fully coherent waves. Here we present a systematic theory of unitary control over the absorption of partially coherent waves by linear systems. Given an absorbing system and incident partially coherent wave, we provide analytical expressions for the range of attainable absorptivity under arbitrary unitary transformations of the incident field. We also present an explicit algorithm to construct the unitary control scheme that achieves any desired absorptivity within that attainable range. As applications of our theory, we derive the conditions required for achieving two new phenomena - partially coherent perfect absorption and partially coherent zero absorption. Furthermore, we prove a theorem relating the coherence properties of the incident field, as quantified by majorization, to the resulting absorption intervals. Our results provide both fundamental insights and practical prescriptions for exploiting unitary control to shape the absorption of partially coherent waves. The theory applies across the electromagnetic spectrum as well as to other classical wave systems such as acoustic waves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05637v1-abstract-full').style.display = 'none'; document.getElementById('2408.05637v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 110, 035430 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.05634">arXiv:2408.05634</a> <span> [<a href="https://arxiv.org/pdf/2408.05634">pdf</a>, <a href="https://arxiv.org/format/2408.05634">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Unitary control of multiport wave transmission </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+A+B">David A. B. Miller</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.05634v1-abstract-short" style="display: inline;"> Controlling wave transmission is crucial for various applications. In this work, we apply the concept of unitary control to manipulate multiport wave transmission. Unitary control aims to control the behaviors of a set of orthogonal waves simultaneously. The approach fully harnesses the capability of wavefront shaping techniques, with promising applications in communication, imaging, and photonic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05634v1-abstract-full').style.display = 'inline'; document.getElementById('2408.05634v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.05634v1-abstract-full" style="display: none;"> Controlling wave transmission is crucial for various applications. In this work, we apply the concept of unitary control to manipulate multiport wave transmission. Unitary control aims to control the behaviors of a set of orthogonal waves simultaneously. The approach fully harnesses the capability of wavefront shaping techniques, with promising applications in communication, imaging, and photonic integrated circuits. Here we present a detailed theory of unitary control of wave transmission, focusing on two key characteristics: total (power) transmittance and direct (field) transmission. The total transmittance for an input port represents the fraction of total transmitted power with respect to the input power for wave incident from an input port. The direct transmission for an input port denotes the complex transmission amplitude from that input port to its corresponding output port. We address two main questions: (i) the achievable total transmittance and direct transmission for each port, and (ii) the configuration of unitary control to attain desired transmission values for each port. Our theory illustrates that unitary control enables uniform total transmittance and direct transmission across any medium. Furthermore, we show that reciprocity and energy conservation enforce direct symmetry constraints on wave transmission in both forward and backward directions under unitary control. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.05634v1-abstract-full').style.display = 'none'; document.getElementById('2408.05634v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.19601">arXiv:2407.19601</a> <span> [<a href="https://arxiv.org/pdf/2407.19601">pdf</a>, <a href="https://arxiv.org/format/2407.19601">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Purcell-enhanced solid-state laser cooling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Benzaouia%2C+M">Mohammed Benzaouia</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.19601v1-abstract-short" style="display: inline;"> We show that Purcell effect can lead to a substantial enhancement in the maximum cooling power for solid-state laser cooling. We numerically demonstrate such enhancement in a patterned slot-waveguide structure using ytterbium-doped silica as the active material. The enhancement arises primarily from the increase of saturation power density and the escape efficiency, and can persist in spite of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19601v1-abstract-full').style.display = 'inline'; document.getElementById('2407.19601v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.19601v1-abstract-full" style="display: none;"> We show that Purcell effect can lead to a substantial enhancement in the maximum cooling power for solid-state laser cooling. We numerically demonstrate such enhancement in a patterned slot-waveguide structure using ytterbium-doped silica as the active material. The enhancement arises primarily from the increase of saturation power density and the escape efficiency, and can persist in spite of the presence of parasitic absorption in the structure surrounding the active material. Our results point to a new opportunity in photonic structure design for optical refrigeration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19601v1-abstract-full').style.display = 'none'; document.getElementById('2407.19601v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.17751">arXiv:2407.17751</a> <span> [<a href="https://arxiv.org/pdf/2407.17751">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Record nighttime electric power generation at a density of 350 mW/m$^2$ via radiative cooling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Assawaworrarit%2C+S">Sid Assawaworrarit</a>, <a href="/search/physics?searchtype=author&query=Zhou%2C+M">Ming Zhou</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+L">Lingling Fan</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.17751v1-abstract-short" style="display: inline;"> The coldness of the universe is a thermodynamic resource that has largely remained untapped for renewable energy generation. Recently, a growing interest in this area has led to a number of studies with the aim to realize the potential of tapping this vast resource for energy generation. While the theoretical calculation based on thermodynamic principles places an upper limit in the power density… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.17751v1-abstract-full').style.display = 'inline'; document.getElementById('2407.17751v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.17751v1-abstract-full" style="display: none;"> The coldness of the universe is a thermodynamic resource that has largely remained untapped for renewable energy generation. Recently, a growing interest in this area has led to a number of studies with the aim to realize the potential of tapping this vast resource for energy generation. While the theoretical calculation based on thermodynamic principles places an upper limit in the power density at the level of 6000 mW/m$^2$, most experimental demonstrations so far result in much lower power density at the level of tens of mW/m$^2$. Here we demonstrate, through design optimization involving the tailoring of the thermal radiation spectrum, the minimization of parasitic heat leakage, and the maximum conversion of heat to electricity, an energy generation system harvesting electricity from the thermal radiation of the ambient heat to the cold universe that achieves a sustained power density of 350 mW/m$^2$. We further demonstrate a power density at the 1000 mW/m$^2$ level using an additional heat source or heat storage that provides access to heat at a temperature above ambient. Our work here shows that the coldness of the universe can be harvested to generate renewable energy at the power density level that approaches the established bound. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.17751v1-abstract-full').style.display = 'none'; document.getElementById('2407.17751v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.16849">arXiv:2407.16849</a> <span> [<a href="https://arxiv.org/pdf/2407.16849">pdf</a>, <a href="https://arxiv.org/format/2407.16849">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Automated modal analysis of entanglement with bipartite self-configuring optics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Karnieli%2C+A">Aviv Karnieli</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+A+B">David A. B. Miller</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.16849v2-abstract-short" style="display: inline;"> Entanglement is a unique feature of quantum mechanics. In coupled systems of light and matter, entanglement manifests itself in the linear superposition of multipartite quantum states (e.g., parametrized by the multiple spatial, spectral, or temporal degrees of freedom of a light field). In bipartite systems, the Schmidt decomposition provides a modal decomposition of the entanglement structure ov… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.16849v2-abstract-full').style.display = 'inline'; document.getElementById('2407.16849v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.16849v2-abstract-full" style="display: none;"> Entanglement is a unique feature of quantum mechanics. In coupled systems of light and matter, entanglement manifests itself in the linear superposition of multipartite quantum states (e.g., parametrized by the multiple spatial, spectral, or temporal degrees of freedom of a light field). In bipartite systems, the Schmidt decomposition provides a modal decomposition of the entanglement structure over independent, separable states. Although ubiquitous as a mathematical tool to describe and measure entanglement, there exists no general efficient experimental method to decompose a bipartite quantum state onto its Schmidt modes. Here, we propose a method that relies on bipartite self-configuring optics that automatically ``learns'' the Schmidt decomposition of an arbitrary pure quantum state. Our method is agnostic to the degrees of freedom over which quantum entanglement is distributed and can reconstruct the Schmidt modes and values by variational optimization of the network's output powers or coincidences. We illustrate our method with numerical examples of spectral entanglement analysis for biphotons generated via spontaneous parametric down conversion and provide experimental guidelines for its realization, including the influence of losses and impurities. Our method provides a versatile and scalable way of analyzing entanglement in bipartite integrated quantum photonic systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.16849v2-abstract-full').style.display = 'none'; document.getElementById('2407.16849v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.13049">arXiv:2407.13049</a> <span> [<a href="https://arxiv.org/pdf/2407.13049">pdf</a>, <a href="https://arxiv.org/ps/2407.13049">ps</a>, <a href="https://arxiv.org/format/2407.13049">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Emerging Quadrature Lattices of Kerr Combs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lustig%2C+E">Eran Lustig</a>, <a href="/search/physics?searchtype=author&query=Guidry%2C+M+A">Melissa A. Guidry</a>, <a href="/search/physics?searchtype=author&query=Lukin%2C+D+M">Daniil M. Lukin</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Vuckovic%2C+J">Jelena Vuckovic</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.13049v2-abstract-short" style="display: inline;"> A quadrature lattice is a coupled array of squeezed vacuum field quadratures that offers new avenues in shaping the quantum properties of multimode light [1-3]. Such lattices are described within the framework of non-Hermitian, non-dissipative physics and exhibit intriguing lattice phenomena such as lattice exceptional points, edge-states, entanglement and non-Hermitian skin effect, offering funda… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13049v2-abstract-full').style.display = 'inline'; document.getElementById('2407.13049v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.13049v2-abstract-full" style="display: none;"> A quadrature lattice is a coupled array of squeezed vacuum field quadratures that offers new avenues in shaping the quantum properties of multimode light [1-3]. Such lattices are described within the framework of non-Hermitian, non-dissipative physics and exhibit intriguing lattice phenomena such as lattice exceptional points, edge-states, entanglement and non-Hermitian skin effect, offering fundamentally new methods for controlling quantum fluctuations [1, 4]. Nonlinear resonators are suitable for studying multimode pair-generation processes and squeezing which are non-dissipative in 蠂(2) and 蠂(3) materials [5-12], but observing non-Hermitian lattice phenomena in photonic quadrature lattices was not achieved. Remarkably, in dissipative Kerr microcombs [13], which have revolutionized photonic technology, such lattices emerge and govern the quantum noise that leads to comb formation. Thus, they offer a unique opportunity to realize quadrature lattices, and to study and manipulate multimode quantum noise which is essential for any quantum technology. Here, we experimentally study non-Hermitian lattice effects in photonic quadrature lattices for the first time. Our photonic quadrature lattices emerge at Kerr microcomb transitions, allowing us to observe fundamental connections between dispersion symmetry, frequency-dependent squeezed supermodes, and non-Hermitian lattice physics in an integrated setup. Our work unifies two major fields, quantum non-Hermitian physics and Kerr combs, and opens the door to utilizing dissipative Kerr combs to experimentally explore rich non-Hermitian physics in the quantum regime, engineer quantum light, and develop new tools to study the quantum noise and formation of Kerr combs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13049v2-abstract-full').style.display = 'none'; document.getElementById('2407.13049v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.18824">arXiv:2406.18824</a> <span> [<a href="https://arxiv.org/pdf/2406.18824">pdf</a>, <a href="https://arxiv.org/format/2406.18824">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.109.L061503">10.1103/PhysRevA.109.L061503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Topological winding guaranteed coherent orthogonal scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.18824v1-abstract-short" style="display: inline;"> Coherent control has enabled various novel phenomena in wave scattering. We introduce an effect called coherent orthogonal scattering, where the output wave becomes orthogonal to the reference output state without scatterers. This effect leads to a unity extinction coefficient and complete mode conversion. We examine the conditions for this effect and reveal its topological nature by relating it t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18824v1-abstract-full').style.display = 'inline'; document.getElementById('2406.18824v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.18824v1-abstract-full" style="display: none;"> Coherent control has enabled various novel phenomena in wave scattering. We introduce an effect called coherent orthogonal scattering, where the output wave becomes orthogonal to the reference output state without scatterers. This effect leads to a unity extinction coefficient and complete mode conversion. We examine the conditions for this effect and reveal its topological nature by relating it to the indivisibility between the dimension and the winding number of scattering submatrices. These findings deepen our understanding of topological scattering phenomena. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.18824v1-abstract-full').style.display = 'none'; document.getElementById('2406.18824v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 7 figures. In press</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 109, L061503 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.00321">arXiv:2406.00321</a> <span> [<a href="https://arxiv.org/pdf/2406.00321">pdf</a>, <a href="https://arxiv.org/format/2406.00321">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-024-08259-2">10.1038/s41586-024-08259-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Non-Abelian lattice gauge fields in the photonic synthetic frequency dimension </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cheng%2C+D">Dali Cheng</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+K">Kai Wang</a>, <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Lustig%2C+E">Eran Lustig</a>, <a href="/search/physics?searchtype=author&query=Long%2C+O+Y">Olivia Y. Long</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Heming Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.00321v1-abstract-short" style="display: inline;"> Non-Abelian gauge fields provide a conceptual framework for the description of particles having spins. The theoretical importance of non-Abelian gauge fields motivates their experimental synthesis and explorations. Here, we demonstrate non-Abelian lattice gauge fields for photons. In the study of gauge fields, lattice models are essential for the understanding of their implications in extended sys… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.00321v1-abstract-full').style.display = 'inline'; document.getElementById('2406.00321v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.00321v1-abstract-full" style="display: none;"> Non-Abelian gauge fields provide a conceptual framework for the description of particles having spins. The theoretical importance of non-Abelian gauge fields motivates their experimental synthesis and explorations. Here, we demonstrate non-Abelian lattice gauge fields for photons. In the study of gauge fields, lattice models are essential for the understanding of their implications in extended systems. We utilize the platform of synthetic frequency dimensions, which enables the study of lattice physics in a scalable and programmable way. We observe Dirac cones at time-reversal-invariant momenta as well as the direction reversal of eigenstate trajectories associated with such Dirac cones. Both of them are unique signatures of non-Abelian gauge fields in our lattice system. Our results highlight the implications of non-Abelian gauge field in the study of topological physics and suggest opportunities for the control of photon spins and pseudospins. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.00321v1-abstract-full').style.display = 'none'; document.getElementById('2406.00321v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature volume 637, pages 52-56 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.15218">arXiv:2404.15218</a> <span> [<a href="https://arxiv.org/pdf/2404.15218">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Highly sensitive and efficient 1550 nm photodetector for room temperature operation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Rituraj"> Rituraj</a>, <a href="/search/physics?searchtype=author&query=Yu%2C+Z+G">Zhi Gang Yu</a>, <a href="/search/physics?searchtype=author&query=Kandegedara%2C+R+M+E+B">R. M. E. B. Kandegedara</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Krishnamurthy%2C+S">Srini Krishnamurthy</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.15218v2-abstract-short" style="display: inline;"> Photonic quantum technologies such as effective quantum communication require room temperature (RT) operating single- or few- photon sensors with high external quantum efficiency (EQE) at 1550 nm wavelength. The leading class of devices in this segment is avalanche photodetectors operating particularly in the Geiger mode. Often the requirements for RT operation and for a high EQE are in conflict,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.15218v2-abstract-full').style.display = 'inline'; document.getElementById('2404.15218v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.15218v2-abstract-full" style="display: none;"> Photonic quantum technologies such as effective quantum communication require room temperature (RT) operating single- or few- photon sensors with high external quantum efficiency (EQE) at 1550 nm wavelength. The leading class of devices in this segment is avalanche photodetectors operating particularly in the Geiger mode. Often the requirements for RT operation and for a high EQE are in conflict, resulting in a compromised solution. We have developed a device which employs a two-dimensional (2D) semiconductor material on a co-optimized dielectric photonic crystal substrate to simultaneously decrease the dark current by three orders of magnitude at RT and maintain an EQE of >99%. The device is amenable to avalanching and form a basis for single photon detection with ultra-low dark current and high photodetection efficiency. Harnessing the high carrier mobility of 2D materials, the device has ~ps jitter time and can be integrated into a large 2D array camera. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.15218v2-abstract-full').style.display = 'none'; document.getElementById('2404.15218v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.00704">arXiv:2402.00704</a> <span> [<a href="https://arxiv.org/pdf/2402.00704">pdf</a>, <a href="https://arxiv.org/format/2402.00704">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41377-024-01622-y">10.1038/s41377-024-01622-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measuring, processing, and generating partially coherent light with self-configuring optics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Roques-Carmes%2C+C">Charles Roques-Carmes</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D">David Miller</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.00704v1-abstract-short" style="display: inline;"> Optical phenomena always display some degree of partial coherence between their respective degrees of freedom. Partial coherence is of particular interest in multimodal systems, where classical and quantum correlations between spatial, polarization, and spectral degrees of freedom can lead to fascinating phenomena (e.g., entanglement) and be leveraged for advanced imaging and sensing modalities (e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.00704v1-abstract-full').style.display = 'inline'; document.getElementById('2402.00704v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.00704v1-abstract-full" style="display: none;"> Optical phenomena always display some degree of partial coherence between their respective degrees of freedom. Partial coherence is of particular interest in multimodal systems, where classical and quantum correlations between spatial, polarization, and spectral degrees of freedom can lead to fascinating phenomena (e.g., entanglement) and be leveraged for advanced imaging and sensing modalities (e.g., in hyperspectral, polarization, and ghost imaging). Here, we present a universal method to analyze, process, and generate spatially partially coherent light in multimode systems by using self-configuring optical networks. Our method relies on cascaded self-configuring layers whose average power outputs are sequentially optimized. Once optimized, the network separates the input light into its mutually incoherent components, which is formally equivalent to a diagonalization of the input density matrix. We illustrate our method with arrays of Mach-Zehnder interferometers and show how this method can be used to perform partially coherent environmental light sensing, generation of multimode partially coherent light with arbitrary coherency matrices, and unscrambling of quantum optical mixtures. We provide guidelines for the experimental realization of this method, paving the way for self-configuring photonic devices that can automatically learn optimal modal representations of partially coherent light fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.00704v1-abstract-full').style.display = 'none'; document.getElementById('2402.00704v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.03494">arXiv:2401.03494</a> <span> [<a href="https://arxiv.org/pdf/2401.03494">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Engineering, Finance, and Science">cs.CE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Pre-insertion resistors temperature prediction based on improved WOA-SVR </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dai%2C+H">Honghe Dai</a>, <a href="/search/physics?searchtype=author&query=Mo%2C+S">Site Mo</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haoxin Wang</a>, <a href="/search/physics?searchtype=author&query=Yin%2C+N">Nan Yin</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Songhai Fan</a>, <a href="/search/physics?searchtype=author&query=Li%2C+B">Bixiong Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.03494v1-abstract-short" style="display: inline;"> The pre-insertion resistors (PIR) within high-voltage circuit breakers are critical components and warm up by generating Joule heat when an electric current flows through them. Elevated temperature can lead to temporary closure failure and, in severe cases, the rupture of PIR. To accurately predict the temperature of PIR, this study combines finite element simulation techniques with Support Vector… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.03494v1-abstract-full').style.display = 'inline'; document.getElementById('2401.03494v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.03494v1-abstract-full" style="display: none;"> The pre-insertion resistors (PIR) within high-voltage circuit breakers are critical components and warm up by generating Joule heat when an electric current flows through them. Elevated temperature can lead to temporary closure failure and, in severe cases, the rupture of PIR. To accurately predict the temperature of PIR, this study combines finite element simulation techniques with Support Vector Regression (SVR) optimized by an Improved Whale Optimization Algorithm (IWOA) approach. The IWOA includes Tent mapping, a convergence factor based on the sigmoid function, and the Ornstein-Uhlenbeck variation strategy. The IWOA-SVR model is compared with the SSA-SVR and WOA-SVR. The results reveal that the prediction accuracies of the IWOA-SVR model were 90.2% and 81.5% (above 100$^\circ$C) in the 3$^\circ$C temperature deviation range and 96.3% and 93.4% (above 100$^\circ$C) in the 4$^\circ$C temperature deviation range, surpassing the performance of the comparative models. This research demonstrates the method proposed can realize the online monitoring of the temperature of the PIR, which can effectively prevent thermal faults PIR and provide a basis for the opening and closing of the circuit breaker within a short period. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.03494v1-abstract-full').style.display = 'none'; document.getElementById('2401.03494v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.09089">arXiv:2312.09089</a> <span> [<a href="https://arxiv.org/pdf/2312.09089">pdf</a>, <a href="https://arxiv.org/format/2312.09089">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> On-Chip Multidimensional Dynamic Control of Twisted Moir茅 Photonic Crystal for Smart Sensing and Imaging </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tang%2C+H">Haoning Tang</a>, <a href="/search/physics?searchtype=author&query=Lou%2C+B">Beicheng Lou</a>, <a href="/search/physics?searchtype=author&query=Du%2C+F">Fan Du</a>, <a href="/search/physics?searchtype=author&query=Gao%2C+G">Guangqi Gao</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+M">Mingjie Zhang</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+X">Xueqi Ni</a>, <a href="/search/physics?searchtype=author&query=Hu%2C+E">Evelyn Hu</a>, <a href="/search/physics?searchtype=author&query=Yacoby%2C+A">Amir Yacoby</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+Y">Yuan Cao</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Mazur%2C+E">Eric Mazur</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.09089v1-abstract-short" style="display: inline;"> Reconfigurable optics, optical systems that have a dynamically tunable configuration, are emerging as a new frontier in photonics research. Recently, twisted moir茅 photonic crystal has become a competitive candidate for implementing reconfigurable optics because of its high degree of tunability. However, despite its great potential as versatile optics components, simultaneous and dynamic modulatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.09089v1-abstract-full').style.display = 'inline'; document.getElementById('2312.09089v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.09089v1-abstract-full" style="display: none;"> Reconfigurable optics, optical systems that have a dynamically tunable configuration, are emerging as a new frontier in photonics research. Recently, twisted moir茅 photonic crystal has become a competitive candidate for implementing reconfigurable optics because of its high degree of tunability. However, despite its great potential as versatile optics components, simultaneous and dynamic modulation of multiple degrees of freedom in twisted moir茅 photonic crystal has remained out of reach, severely limiting its area of application. In this paper, we present a MEMS-integrated twisted moir茅 photonic crystal sensor that offers precise control over the interlayer gap and twist angle between two photonic crystal layers, and demonstrate an active twisted moir茅 photonic crystal-based optical sensor that can simultaneously resolve wavelength and polarization. Leveraging twist- and gap-tuned resonance modes, we achieve high-accuracy spectropolarimetric reconstruction of light using an adaptive sensing algorithm over a broad operational bandwidth in the telecom range and full Poincar茅 sphere. Our research showcases the remarkable capabilities of multidimensional control over emergent degrees of freedom in reconfigurable nanophotonics platforms and establishes a scalable pathway towards creating comprehensive flat-optics devices suitable for versatile light manipulation and information processing tasks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.09089v1-abstract-full').style.display = 'none'; document.getElementById('2312.09089v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.01691">arXiv:2312.01691</a> <span> [<a href="https://arxiv.org/pdf/2312.01691">pdf</a>, <a href="https://arxiv.org/format/2312.01691">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Space Physics">physics.space-ph</span> </div> </div> <p class="title is-5 mathjax"> Estimating Coronal Mass Ejection Mass and Kinetic Energy by Fusion of Multiple Deep-learning Models </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alobaid%2C+K+A">Khalid A. Alobaid</a>, <a href="/search/physics?searchtype=author&query=Abduallah%2C+Y">Yasser Abduallah</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+J+T+L">Jason T. L. Wang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Haimin Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shen Fan</a>, <a href="/search/physics?searchtype=author&query=Li%2C+J">Jialiang Li</a>, <a href="/search/physics?searchtype=author&query=Cavus%2C+H">Huseyin Cavus</a>, <a href="/search/physics?searchtype=author&query=Yurchyshyn%2C+V">Vasyl Yurchyshyn</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.01691v1-abstract-short" style="display: inline;"> Coronal mass ejections (CMEs) are massive solar eruptions, which have a significant impact on Earth. In this paper, we propose a new method, called DeepCME, to estimate two properties of CMEs, namely, CME mass and kinetic energy. Being able to estimate these properties helps better understand CME dynamics. Our study is based on the CME catalog maintained at the Coordinated Data Analysis Workshops… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01691v1-abstract-full').style.display = 'inline'; document.getElementById('2312.01691v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.01691v1-abstract-full" style="display: none;"> Coronal mass ejections (CMEs) are massive solar eruptions, which have a significant impact on Earth. In this paper, we propose a new method, called DeepCME, to estimate two properties of CMEs, namely, CME mass and kinetic energy. Being able to estimate these properties helps better understand CME dynamics. Our study is based on the CME catalog maintained at the Coordinated Data Analysis Workshops (CDAW) Data Center, which contains all CMEs manually identified since 1996 using the Large Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). We use LASCO C2 data in the period between January 1996 and December 2020 to train, validate and test DeepCME through 10-fold cross validation. The DeepCME method is a fusion of three deep learning models, including ResNet, InceptionNet, and InceptionResNet. Our fusion model extracts features from LASCO C2 images, effectively combining the learning capabilities of the three component models to jointly estimate the mass and kinetic energy of CMEs. Experimental results show that the fusion model yields a mean relative error (MRE) of 0.013 (0.009, respectively) compared to the MRE of 0.019 (0.017, respectively) of the best component model InceptionResNet (InceptionNet, respectively) in estimating the CME mass (kinetic energy, respectively). To our knowledge, this is the first time that deep learning has been used for CME mass and kinetic energy estimations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01691v1-abstract-full').style.display = 'none'; document.getElementById('2312.01691v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> The Astrophysical Journal Letters, 958:L34, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.12030">arXiv:2311.12030</a> <span> [<a href="https://arxiv.org/pdf/2311.12030">pdf</a>, <a href="https://arxiv.org/format/2311.12030">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> On-chip multi-degree-of-freedom control of two-dimensional quantum and nonlinear materials </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tang%2C+H">Haoning Tang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Y">Yiting Wang</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+X">Xueqi Ni</a>, <a href="/search/physics?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/physics?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/physics?searchtype=author&query=Jarillo-Herrero%2C+P">Pablo Jarillo-Herrero</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Mazur%2C+E">Eric Mazur</a>, <a href="/search/physics?searchtype=author&query=Yacoby%2C+A">Amir Yacoby</a>, <a href="/search/physics?searchtype=author&query=Cao%2C+Y">Yuan Cao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.12030v3-abstract-short" style="display: inline;"> Two-dimensional materials (2DM) and their derived heterostructures have electrical and optical properties that are widely tunable via several approaches, most notably electrostatic gating and interfacial engineering such as twisting. While electrostatic gating is simple and has been ubiquitously employed on 2DM, being able to tailor the interfacial properties in a similar real-time manner represen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12030v3-abstract-full').style.display = 'inline'; document.getElementById('2311.12030v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.12030v3-abstract-full" style="display: none;"> Two-dimensional materials (2DM) and their derived heterostructures have electrical and optical properties that are widely tunable via several approaches, most notably electrostatic gating and interfacial engineering such as twisting. While electrostatic gating is simple and has been ubiquitously employed on 2DM, being able to tailor the interfacial properties in a similar real-time manner represents the next leap in our ability to modulate the underlying physics and build exotic devices with 2DM. However, all existing approaches rely on external machinery such as scanning microscopes, which often limit their scope of applications, and there is currently no means of tuning a 2D interface that has the same accessibility and scalability as electrostatic gating. Here, we demonstrate the first on-chip platform designed for 2D materials with in situ tunable interfacial properties, utilizing a microelectromechanical system (MEMS). Each compact, cost-effective, and versatile device is a standalone micromachine that allows voltage-controlled approaching, twisting, and pressurizing of 2DM with high accuracy. As a demonstration, we engineer synthetic topological singularities, known as merons, in the nonlinear optical susceptibility of twisted hexagonal boron nitride (h-BN), via simultaneous control of twist angle and interlayer separation. The chirality of the resulting moire pattern further induces a strong circular dichroism in the second-harmonic generation. A potential application of this topological nonlinear susceptibility is to create integrated classical and quantum light sources that have widely and real-time tunable polarization. Our invention pushes the boundary of available technologies for manipulating low-dimensional quantum materials, which in turn opens up the gateway for designing future hybrid 2D-3D devices for condensed-matter physics, quantum optics, and beyond. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12030v3-abstract-full').style.display = 'none'; document.getElementById('2311.12030v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.12029">arXiv:2311.12029</a> <span> [<a href="https://arxiv.org/pdf/2311.12029">pdf</a>, <a href="https://arxiv.org/format/2311.12029">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Three Dimensional Reconfigurable Optical Singularities in Bilayer Photonic Crystals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ni%2C+X">Xueqi Ni</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Y">Yuan Liu</a>, <a href="/search/physics?searchtype=author&query=Lou%2C+B">Beicheng Lou</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+M">Mingjie Zhang</a>, <a href="/search/physics?searchtype=author&query=Hu%2C+E+L">Evelyn L. Hu</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Mazur%2C+E">Eric Mazur</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+H">Haoning Tang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.12029v1-abstract-short" style="display: inline;"> Metasurfaces and photonic crystals have revolutionized classical and quantum manipulation of light, and opened the door to studying various optical singularities related to phases and polarization states. However, traditional nanophotonic devices lack reconfigurability, hindering the dynamic switching and optimization of optical singularities. This paper delves into the underexplored concept of tu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12029v1-abstract-full').style.display = 'inline'; document.getElementById('2311.12029v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.12029v1-abstract-full" style="display: none;"> Metasurfaces and photonic crystals have revolutionized classical and quantum manipulation of light, and opened the door to studying various optical singularities related to phases and polarization states. However, traditional nanophotonic devices lack reconfigurability, hindering the dynamic switching and optimization of optical singularities. This paper delves into the underexplored concept of tunable bilayer photonic crystals (BPhCs), which offer rich interlayer coupling effects. Utilizing silicon nitride-based BPhCs, we demonstrate tunable bidirectional and unidirectional polarization singularities, along with spatiotemporal phase singularities. Leveraging these tunable singularities, we achieve dynamic modulation of bound-state-in-continuum states, unidirectional guided resonances, and both longitudinal and transverse orbital angular momentum. Our work paves the way for multidimensional control over polarization and phase, inspiring new directions in ultrafast optics, optoelectronics, and quantum optics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.12029v1-abstract-full').style.display = 'none'; document.getElementById('2311.12029v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.00849">arXiv:2311.00849</a> <span> [<a href="https://arxiv.org/pdf/2311.00849">pdf</a>, <a href="https://arxiv.org/format/2311.00849">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Functional Analysis">math.FA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Operator Algebras">math.OA</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Spectral Theory">math.SP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Winding number criterion for the origin to belong to the numerical range of a matrix on a loop of matrices </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.00849v1-abstract-short" style="display: inline;"> Let $A:[0,1]\to GL(n,\mathbb{C})$ be continuous with $A(0)=A(1)$, thus the winding number of $\det A$ is well-defined. If the winding number is not divisible by $n$, then the origin belongs to the numerical range of $A(蠁)$ for some $蠁\in [0,1]$. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.00849v1-abstract-full" style="display: none;"> Let $A:[0,1]\to GL(n,\mathbb{C})$ be continuous with $A(0)=A(1)$, thus the winding number of $\det A$ is well-defined. If the winding number is not divisible by $n$, then the origin belongs to the numerical range of $A(蠁)$ for some $蠁\in [0,1]$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.00849v1-abstract-full').style.display = 'none'; document.getElementById('2311.00849v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 15A60 (Primary) 55M25 (Secondary) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.18856">arXiv:2310.18856</a> <span> [<a href="https://arxiv.org/pdf/2310.18856">pdf</a>, <a href="https://arxiv.org/format/2310.18856">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Stochastic modeling of superconducting qudits in the dispersive regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yu%2C+K">Kangdi Yu</a>, <a href="/search/physics?searchtype=author&query=Sarihan%2C+M+C">Murat C. Sarihan</a>, <a href="/search/physics?searchtype=author&query=Kang%2C+J+H">Jin Ho Kang</a>, <a href="/search/physics?searchtype=author&query=Taylor%2C+M">Madeline Taylor</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+C+S">Cody S. Fan</a>, <a href="/search/physics?searchtype=author&query=Banerjee%2C+A">Ananyo Banerjee</a>, <a href="/search/physics?searchtype=author&query=DuBois%2C+J+L">Jonathan L. DuBois</a>, <a href="/search/physics?searchtype=author&query=Rosen%2C+Y+J">Yaniv J. Rosen</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+C+W">Chee Wei Wong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.18856v2-abstract-short" style="display: inline;"> The field of superconducting quantum computing, based on Josephson junctions, has recently seen remarkable strides in scaling the number of logical qubits. In particular, the fidelities of one- and two-qubit gates have reached the breakeven point with the novel error mitigation and correction methods. Parallel to these advances is the effort to expand the Hilbert space within a single junction or… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.18856v2-abstract-full').style.display = 'inline'; document.getElementById('2310.18856v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.18856v2-abstract-full" style="display: none;"> The field of superconducting quantum computing, based on Josephson junctions, has recently seen remarkable strides in scaling the number of logical qubits. In particular, the fidelities of one- and two-qubit gates have reached the breakeven point with the novel error mitigation and correction methods. Parallel to these advances is the effort to expand the Hilbert space within a single junction or device by employing high-dimensional qubits, otherwise known as qudits. Research has demonstrated the possibility of driving higher-order transitions in a transmon or designing innovative multimode superconducting circuits, termed multimons. These advances can significantly expand the computational basis while simplifying the interconnects in a large-scale quantum processor. In this work we extend the measurement theory of a conventional superconducting qubit to that of a qudit, focusing on modeling the dispersive quadrature measurement in an open quantum system. Under the Markov assumption, the qudit Lindblad and stochastic master equations are formulated and analyzed; in addition, both the ensemble-averaged and the quantum-jump approach of decoherence analysis are detailed with analytical and numerical comparisons. We verify our stochastic model with a series of experimental results on a transmon-type qutrit, verifying the validity of our high-dimensional formalism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.18856v2-abstract-full').style.display = 'none'; document.getElementById('2310.18856v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16-page main text, 6 figures, 15-page appendices (correct minor errors in the derivation)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.08692">arXiv:2310.08692</a> <span> [<a href="https://arxiv.org/pdf/2310.08692">pdf</a>, <a href="https://arxiv.org/format/2310.08692">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2401514121">10.1073/pnas.2401514121 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time-modulated near-field radiative heat transfer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yu%2C+R">Renwen Yu</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.08692v1-abstract-short" style="display: inline;"> We explore near-field radiative heat transfer between two bodies under time modulation by developing a rigorous fluctuational electrodynamics formalism. We demonstrate that time modulation can results in the enhancement, suppression, elimination, or reversal of radiative heat flow between the two bodies, and can be used to create a radiative thermal diode with infinite contrast ratio, as well as a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.08692v1-abstract-full').style.display = 'inline'; document.getElementById('2310.08692v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.08692v1-abstract-full" style="display: none;"> We explore near-field radiative heat transfer between two bodies under time modulation by developing a rigorous fluctuational electrodynamics formalism. We demonstrate that time modulation can results in the enhancement, suppression, elimination, or reversal of radiative heat flow between the two bodies, and can be used to create a radiative thermal diode with infinite contrast ratio, as well as a near-field radiative heat engine that pumps heat from the cold to the hot bodies. The formalism reveals a fundamental symmetry relation in the radiative heat transfer coefficients that underlies these effects. Our results indicate the significant capabilities of time modulation for managing nanoscale heat flow. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.08692v1-abstract-full').style.display = 'none'; document.getElementById('2310.08692v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS 121, e2401514121 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.04025">arXiv:2310.04025</a> <span> [<a href="https://arxiv.org/pdf/2310.04025">pdf</a>, <a href="https://arxiv.org/format/2310.04025">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Mesoscopic non-Hermitian skin effect </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Poddubny%2C+A">Alexander Poddubny</a>, <a href="/search/physics?searchtype=author&query=Zhong%2C+J">Janet Zhong</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.04025v1-abstract-short" style="display: inline;"> We discuss a generalization of the non-Hermitian skin effect to finite-size photonic structures with neither gain nor loss in the bulk and purely real energy spectrum under periodic boundary conditions (PBC). We show that such systems can still have significant portions of eigenmodes concentrated at the edges and that this edge concentration can be linked to the non-trivial point-gap topology… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.04025v1-abstract-full').style.display = 'inline'; document.getElementById('2310.04025v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.04025v1-abstract-full" style="display: none;"> We discuss a generalization of the non-Hermitian skin effect to finite-size photonic structures with neither gain nor loss in the bulk and purely real energy spectrum under periodic boundary conditions (PBC). We show that such systems can still have significant portions of eigenmodes concentrated at the edges and that this edge concentration can be linked to the non-trivial point-gap topology of the size-dependent regularized PBC spectrum, accounting for the radiative losses. As an example, we consider the chiral waveguide quantum electrodynamics platform with an array of atoms coupled to the waveguide. The proposed mesoscopic analogue of the non-Hermitian skin effect could be potentially applied to other seemingly lossless photonic structures, such as chiral resonant all-dielectric metamaterials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.04025v1-abstract-full').style.display = 'none'; document.getElementById('2310.04025v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.14845">arXiv:2307.14845</a> <span> [<a href="https://arxiv.org/pdf/2307.14845">pdf</a>, <a href="https://arxiv.org/format/2307.14845">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Eigenenergy braids in 2D photonic crystals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhong%2C+J">Janet Zhong</a>, <a href="/search/physics?searchtype=author&query=Wojcik%2C+C+C">Charles C. Wojcik</a>, <a href="/search/physics?searchtype=author&query=Cheng%2C+D">Dali Cheng</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.14845v2-abstract-short" style="display: inline;"> We consider non-Hermitian energy band theory in two-dimensional systems, and study eigenenergy braids on slices in the two-dimensional Brillouin zone. We show the consequences of reciprocity and geometric symmetry on such eigenenergy braids. The point-gap topology of the energy bands can be found from the projection of the eigenenergy braid onto the complex energy plane. We show that the conjugacy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.14845v2-abstract-full').style.display = 'inline'; document.getElementById('2307.14845v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.14845v2-abstract-full" style="display: none;"> We consider non-Hermitian energy band theory in two-dimensional systems, and study eigenenergy braids on slices in the two-dimensional Brillouin zone. We show the consequences of reciprocity and geometric symmetry on such eigenenergy braids. The point-gap topology of the energy bands can be found from the projection of the eigenenergy braid onto the complex energy plane. We show that the conjugacy class transitions in the eigenenergy braid results in the changes in the number of bands in a complete point-gap loop. This transition occurs at exceptional points. We numerically demonstrate these concepts using two-dimensional reciprocal and nonreciprocal photonic crystals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.14845v2-abstract-full').style.display = 'none'; document.getElementById('2307.14845v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">comments welcome :)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.09275">arXiv:2307.09275</a> <span> [<a href="https://arxiv.org/pdf/2307.09275">pdf</a>, <a href="https://arxiv.org/format/2307.09275">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-024-45225-y">10.1038/s41467-024-45225-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optical Tellegen metamaterial with spontaneous magnetization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Jazi%2C+S+S">S. S. Jazi</a>, <a href="/search/physics?searchtype=author&query=Faniayeu%2C+I">I. Faniayeu</a>, <a href="/search/physics?searchtype=author&query=Cichelero%2C+R">R. Cichelero</a>, <a href="/search/physics?searchtype=author&query=Tzarouchis%2C+D+C">D. C. Tzarouchis</a>, <a href="/search/physics?searchtype=author&query=Asgari%2C+M+M">M. M. Asgari</a>, <a href="/search/physics?searchtype=author&query=Dmitriev%2C+A">A. Dmitriev</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">S. Fan</a>, <a href="/search/physics?searchtype=author&query=Asadchy%2C+V">V. Asadchy</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.09275v1-abstract-short" style="display: inline;"> The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises a number of groundbreaking phenomena connected to fundamental (e.g., electrodynamics of axion and relativistic matter) and applied physics (e.g., magnetless isolators). We propose a three-dimensional metamaterial with an isotropic and resonant Tellegen response in the visible frequency range. The metamaterial is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.09275v1-abstract-full').style.display = 'inline'; document.getElementById('2307.09275v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.09275v1-abstract-full" style="display: none;"> The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises a number of groundbreaking phenomena connected to fundamental (e.g., electrodynamics of axion and relativistic matter) and applied physics (e.g., magnetless isolators). We propose a three-dimensional metamaterial with an isotropic and resonant Tellegen response in the visible frequency range. The metamaterial is formed by randomly oriented bi-material nanocylinders in a host medium. Each nanocylinder consists of a ferromagnet in a single-domain magnetic state and a high-permittivity dielectric operating near the magnetic Mie-type resonance. The proposed metamaterial requires no external magnetic bias and operates on the spontaneous magnetization of the nanocylinders. By leveraging the emerging magnetic Weyl semimetals, we further show how a giant bulk effective magnetoelectric effect can be achieved in a proposed metamaterial, exceeding that of natural materials by almost four orders of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.09275v1-abstract-full').style.display = 'none'; document.getElementById('2307.09275v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat Commun 15, 1293 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.03850">arXiv:2306.03850</a> <span> [<a href="https://arxiv.org/pdf/2306.03850">pdf</a>, <a href="https://arxiv.org/format/2306.03850">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Topological nature of non-Hermitian degenerate bands in structural parameter space </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Long%2C+O+Y">Olivia Y. Long</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+C">Cheng Guo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.03850v1-abstract-short" style="display: inline;"> In photonics, band degeneracies at high-symmetry points in wavevector space have been shown to exhibit rich physical phenomena. However, obtaining degenerate bands away from such points is highly nontrivial. In this work, we achieve complex band degeneracy in a photonic crystal structure over a region of momentum space. We show that this band degeneracy corresponds to polarization-independent tran… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.03850v1-abstract-full').style.display = 'inline'; document.getElementById('2306.03850v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.03850v1-abstract-full" style="display: none;"> In photonics, band degeneracies at high-symmetry points in wavevector space have been shown to exhibit rich physical phenomena. However, obtaining degenerate bands away from such points is highly nontrivial. In this work, we achieve complex band degeneracy in a photonic crystal structure over a region of momentum space. We show that this band degeneracy corresponds to polarization-independent transmission, which can be harnessed for nonlocal metasurface design. Moreover, we find that the band degeneracy manifests as a topological singularity in the structural parameter space of the system. Our work highlights the importance of topological concepts in the design of polarization-independent photonic structures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.03850v1-abstract-full').style.display = 'none'; document.getElementById('2306.03850v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.19002">arXiv:2305.19002</a> <span> [<a href="https://arxiv.org/pdf/2305.19002">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1039/D3TA06286D">10.1039/D3TA06286D <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> VO2 Phase Change Electrodes in Li-ion Batteries </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Castro-Pardo%2C+S">Samuel Castro-Pardo</a>, <a href="/search/physics?searchtype=author&query=Puthirath%2C+A+B">Anand B. Puthirath</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shaoxun Fan</a>, <a href="/search/physics?searchtype=author&query=Saju%2C+S">Sreehari Saju</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+G">Guang Yang</a>, <a href="/search/physics?searchtype=author&query=Nanda%2C+J">Jagjit Nanda</a>, <a href="/search/physics?searchtype=author&query=Vajtai%2C+R">Robert Vajtai</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+M">Ming Tang</a>, <a href="/search/physics?searchtype=author&query=Ajayan%2C+P+M">Pulickel M. Ajayan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.19002v1-abstract-short" style="display: inline;"> Use of electrode materials that show phase change behavior and hence drastic changes in electrochemical activity during operation, have not been explored for Li-ion batteries. Here we demonstrate the vanadium oxide (VO2) cathode that undergoes metal-insulator transition due to first-order structural phase transition at accessible temperature of 68掳C for battery operation. Using a suitable electrol… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19002v1-abstract-full').style.display = 'inline'; document.getElementById('2305.19002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.19002v1-abstract-full" style="display: none;"> Use of electrode materials that show phase change behavior and hence drastic changes in electrochemical activity during operation, have not been explored for Li-ion batteries. Here we demonstrate the vanadium oxide (VO2) cathode that undergoes metal-insulator transition due to first-order structural phase transition at accessible temperature of 68掳C for battery operation. Using a suitable electrolyte operable across the phase transition range and compatible with vanadium oxide cathodes, we studied the effect of electrode structure change on lithium insertion followed by the electrochemical characteristics above and below the phase transition temperature. The high-temperature VO2 phase shows significantly improved capacitance, enhanced current rate capabilities, improved electrical conductivity and lithium-ion diffusivity compared to the insulating low temperature phase. This opens up new avenues for electrode designs, allowing manipulation of electrochemical reactions around phase transition temperatures, and in particular enhancing electrochemical properties at elevated temperatures contrary to existing classes of battery chemistries that lead to performance deterioration at elevated temperatures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19002v1-abstract-full').style.display = 'none'; document.getElementById('2305.19002v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Mater. Chem. A, 2024, Advance Article </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.09270">arXiv:2305.09270</a> <span> [<a href="https://arxiv.org/pdf/2305.09270">pdf</a>, <a href="https://arxiv.org/ps/2305.09270">ps</a>, <a href="https://arxiv.org/format/2305.09270">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Tunable all-optical logic gates based on nonreciprocal topologically protected edge modes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xu%2C+J">Jie Xu</a>, <a href="/search/physics?searchtype=author&query=He%2C+P">Panpan He</a>, <a href="/search/physics?searchtype=author&query=Feng%2C+D">Delong Feng</a>, <a href="/search/physics?searchtype=author&query=Luo%2C+Y">Yamei Luo</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Siqiang Fan</a>, <a href="/search/physics?searchtype=author&query=Yong%2C+K">Kangle Yong</a>, <a href="/search/physics?searchtype=author&query=Tsakmakidis%2C+K+L">Kosmas L. Tsakmakidis</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.09270v1-abstract-short" style="display: inline;"> All-optical logic gates have been studied intensively for their potential to enable broadband, low-loss, and high-speed communication. However, poor tunability has remained a key challenge in this field. In this paper, we propose a Y-shaped structure composed of Yttrium Iron Garnet (YIG) layers that can serve as tunable all-optical logic gates, including, but not limited to, OR, AND, and NOT gates… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09270v1-abstract-full').style.display = 'inline'; document.getElementById('2305.09270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.09270v1-abstract-full" style="display: none;"> All-optical logic gates have been studied intensively for their potential to enable broadband, low-loss, and high-speed communication. However, poor tunability has remained a key challenge in this field. In this paper, we propose a Y-shaped structure composed of Yttrium Iron Garnet (YIG) layers that can serve as tunable all-optical logic gates, including, but not limited to, OR, AND, and NOT gates, by applying external magnetic fields to magnetize the YIG layers. Our findings demonstrate that these logic gates are based on topologically protected one-way edge modes, ensuring exceptional robustness against imperfections and nonlocal effects while maintaining extremely high precision. Furthermore, the operating band of the logic gates is shown to be tunable. In addition, we introduce a straightforward and practical method for controlling and switching the logic gates between "work", "skip", and "stop" modes. These findings have important implications for the design of high-performance and precise all-optical integrated circuits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09270v1-abstract-full').style.display = 'none'; document.getElementById('2305.09270v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.03250">arXiv:2305.03250</a> <span> [<a href="https://arxiv.org/pdf/2305.03250">pdf</a>, <a href="https://arxiv.org/format/2305.03250">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Experimentally Realizing Convolution Processing in the Photonic Synthetic Frequency Dimension </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fan%2C+L">Lingling Fan</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+K">Kai Wang</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">Heming Wang</a>, <a href="/search/physics?searchtype=author&query=Dutt%2C+A">Avik Dutt</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.03250v2-abstract-short" style="display: inline;"> Convolution is an essential operation in signal and image processing and consumes most of the computing power in convolutional neural networks. Photonic convolution has the promise of addressing computational bottlenecks and outperforming electronic implementations. Performing photonic convolution in the synthetic frequency dimension, which harnesses the dynamics of light in the spectral degrees o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.03250v2-abstract-full').style.display = 'inline'; document.getElementById('2305.03250v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.03250v2-abstract-full" style="display: none;"> Convolution is an essential operation in signal and image processing and consumes most of the computing power in convolutional neural networks. Photonic convolution has the promise of addressing computational bottlenecks and outperforming electronic implementations. Performing photonic convolution in the synthetic frequency dimension, which harnesses the dynamics of light in the spectral degrees of freedom for photons, can lead to highly compact devices. Here we experimentally realize convolution operations in the synthetic frequency dimension. Using a modulated ring resonator, we synthesize arbitrary convolution kernels using a pre-determined modulation waveform with high accuracy. We demonstrate the convolution computation between input frequency combs and synthesized kernels. We also introduce the idea of an additive offset to broaden the kinds of kernels that can be implemented experimentally when the modulation strength is limited. Our work demonstrate the use of synthetic frequency dimension to efficiently encode data and implement computation tasks, leading to a compact and scalable photonic computation architecture. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.03250v2-abstract-full').style.display = 'none'; document.getElementById('2305.03250v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Science Advances, in press</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.11676">arXiv:2304.11676</a> <span> [<a href="https://arxiv.org/pdf/2304.11676">pdf</a>, <a href="https://arxiv.org/format/2304.11676">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Quantum correlated photons via a passive nonlinear microcavity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zhao%2C+M">Mengdi Zhao</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+Y">Yunkai Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Fang%2C+K">Kejie Fang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.11676v2-abstract-short" style="display: inline;"> Photons, by nature, typically do not exhibit interactions with each other. Creating photon-photon interactions holds immense importance in both fundamental physics and quantum technologies. Currently, such interactions have only been achieved indirectly as mediated by atomic-like quantum emitters with resonant photon-atom interactions. However, the use of these indirect interactions presents subst… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.11676v2-abstract-full').style.display = 'inline'; document.getElementById('2304.11676v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.11676v2-abstract-full" style="display: none;"> Photons, by nature, typically do not exhibit interactions with each other. Creating photon-photon interactions holds immense importance in both fundamental physics and quantum technologies. Currently, such interactions have only been achieved indirectly as mediated by atomic-like quantum emitters with resonant photon-atom interactions. However, the use of these indirect interactions presents substantial fundamental challenges that impede scaling and practical applications. Here we demonstrate creation of non-classical photon correlations, including photon anti-bunching, via a passive InGaP photonic integrated circuit. Our approach employs the quantum interference between uncorrelated light and the two-photon bound state, the latter of which arises from the $蠂^{(2)}$-mediated photon interaction. Our work opens a new route in controlling quantum light by harnessing highly-engineerable bulk optical nonlinearities, which has significant implications for nonlinear optical quantum information processing and quantum networking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.11676v2-abstract-full').style.display = 'none'; document.getElementById('2304.11676v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 15 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.09271">arXiv:2304.09271</a> <span> [<a href="https://arxiv.org/pdf/2304.09271">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Tunable Magnetless Optical Isolation with Twisted Weyl Semimetals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chistyakov%2C+V">Vladislav Chistyakov</a>, <a href="/search/physics?searchtype=author&query=Asadchy%2C+V+S">Viktar S. Asadchy</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Alu%2C+A">Andrea Alu</a>, <a href="/search/physics?searchtype=author&query=Krasnok%2C+A">Alex Krasnok</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.09271v1-abstract-short" style="display: inline;"> Weyl semimetals hold great promise in revolutionizing nonreciprocal optical components due to their unique topological properties. By exhibiting nonreciprocal magneto-optical effects without necessitating an external magnetic field, these materials offer remarkable miniaturization opportunities and reduced energy consumption. However, their intrinsic topological robustness poses a challenge for ap… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.09271v1-abstract-full').style.display = 'inline'; document.getElementById('2304.09271v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.09271v1-abstract-full" style="display: none;"> Weyl semimetals hold great promise in revolutionizing nonreciprocal optical components due to their unique topological properties. By exhibiting nonreciprocal magneto-optical effects without necessitating an external magnetic field, these materials offer remarkable miniaturization opportunities and reduced energy consumption. However, their intrinsic topological robustness poses a challenge for applications demanding tunability. In this work, we introduce an innovative approach to enhance the tunability of their response, utilizing multilayered configurations of twisted anisotropic Weyl semimetals. Our design enables controlled and reversible isolation by adjusting the twist angle between the anisotropic layers. When implemented in the Faraday geometry within the mid-IR frequency range, our design delivers impressive isolation, exceeding 50 dB, while maintaining a minimal insertion loss of just 0.33 dB. Moreover, the in-plane anisotropy of Weyl semimetals eliminates one or both polarizers of a conventional isolator geometry, significantly reducing the overall dimensions. These results set the stage for creating highly adaptable, ultra-compact optical isolators that can propel the fields of integrated photonics and quantum technology applications to new heights. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.09271v1-abstract-full').style.display = 'none'; document.getElementById('2304.09271v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.10545">arXiv:2303.10545</a> <span> [<a href="https://arxiv.org/pdf/2303.10545">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41377-023-01196-1">10.1038/s41377-023-01196-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-dimensional band structure spectroscopy in the synthetic frequency dimension </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cheng%2C+D">Dali Cheng</a>, <a href="/search/physics?searchtype=author&query=Lustig%2C+E">Eran Lustig</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+K">Kai Wang</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.10545v1-abstract-short" style="display: inline;"> The concept of synthetic dimensions in photonics provides a versatile platform in exploring multi-dimensional physics. Many of these physics are characterized by band structures in more than one dimensions. Existing efforts on band structure measurements in the photonic synthetic frequency dimension however are limited to either one-dimensional Brillouin zones or one-dimensional subsets of multi-d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.10545v1-abstract-full').style.display = 'inline'; document.getElementById('2303.10545v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.10545v1-abstract-full" style="display: none;"> The concept of synthetic dimensions in photonics provides a versatile platform in exploring multi-dimensional physics. Many of these physics are characterized by band structures in more than one dimensions. Existing efforts on band structure measurements in the photonic synthetic frequency dimension however are limited to either one-dimensional Brillouin zones or one-dimensional subsets of multi-dimensional Brillouin zones. Here we theoretically propose and experimentally demonstrate a method to fully measure multi-dimensional band structures in the synthetic frequency dimension. We use a single photonic resonator under dynamical modulation to create a multi-dimensional synthetic frequency lattice. We show that the band structure of such a lattice over the entire multi-dimensional Brillouin zone can be measured by introducing a gauge potential into the lattice Hamiltonian. Using this method, we perform experimental measurements of two-dimensional band structures of a Hermitian and a non-Hermitian Hamiltonian. The measurements reveal some of the general properties of point-gap topology of the non-Hermitian Hamiltonian in more than one dimensions. Our results demonstrate experimental capabilities to fully characterize high-dimensional physical phenomena in the photonic synthetic frequency dimension. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.10545v1-abstract-full').style.display = 'none'; document.getElementById('2303.10545v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Light Sci. Appl. 12, 158 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.02325">arXiv:2303.02325</a> <span> [<a href="https://arxiv.org/pdf/2303.02325">pdf</a>, <a href="https://arxiv.org/format/2303.02325">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> On-chip optical twisted bilayer photonic crystal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tang%2C+H">Haoning Tang</a>, <a href="/search/physics?searchtype=author&query=Lou%2C+B">Beicheng Lou</a>, <a href="/search/physics?searchtype=author&query=Du%2C+F">Fan Du</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+M">Mingjie Zhang</a>, <a href="/search/physics?searchtype=author&query=Ni%2C+X">Xueqi Ni</a>, <a href="/search/physics?searchtype=author&query=Xu%2C+W">Weijie Xu</a>, <a href="/search/physics?searchtype=author&query=Jin%2C+R">Rebekah Jin</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Mazur%2C+E">Eric Mazur</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.02325v1-abstract-short" style="display: inline;"> Recently, moir茅 engineering has been extensively employed for creating and studying novel electronic materials in two dimensions. However, its application in nanophotonic systems has not been widely explored so far. Here, we demonstrate that twisted bilayer photonic crystals provide a new photonic platform with twist-angle-tunable optical dispersion. Compared to twisted two-dimensional materials,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.02325v1-abstract-full').style.display = 'inline'; document.getElementById('2303.02325v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.02325v1-abstract-full" style="display: none;"> Recently, moir茅 engineering has been extensively employed for creating and studying novel electronic materials in two dimensions. However, its application in nanophotonic systems has not been widely explored so far. Here, we demonstrate that twisted bilayer photonic crystals provide a new photonic platform with twist-angle-tunable optical dispersion. Compared to twisted two-dimensional materials, twisted bilayer photonic crystals host a rich set of physics and provide a much larger number of degrees of freedom choice of material, lattice symmetry, feature size, twist angle, and interlayer gap, which promises an unprecedented toolbox for tailoring optical properties. We directly visualize the dispersion throughout the optical frequency range and show that the measured optical response is in good quantitative agreement with numerical and analytical results. Our results reveal a highly tunable band structure of twisted bilayer photonic crystals due to moir茅 scattering. This work opens the door to exploring unconventional physics and novel applications in photonics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.02325v1-abstract-full').style.display = 'none'; document.getElementById('2303.02325v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.01261">arXiv:2302.01261</a> <span> [<a href="https://arxiv.org/pdf/2302.01261">pdf</a>, <a href="https://arxiv.org/format/2302.01261">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.096902">10.1103/PhysRevLett.130.096902 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Manipulating coherence of near-field thermal radiation in time-modulated systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yu%2C+R">Renwen Yu</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.01261v2-abstract-short" style="display: inline;"> We show that the spatial coherence of thermal radiation can be manipulated in time-modulated photonic systems supporting surface polaritons. We develop a fluctuational electrodynamics formalism for such systems to calculate the cross-spectral density tensor of the emitted thermal electromagnetic fields in the near-field regime. Our calculations indicate that, due to time-modulation, spatial cohere… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.01261v2-abstract-full').style.display = 'inline'; document.getElementById('2302.01261v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.01261v2-abstract-full" style="display: none;"> We show that the spatial coherence of thermal radiation can be manipulated in time-modulated photonic systems supporting surface polaritons. We develop a fluctuational electrodynamics formalism for such systems to calculate the cross-spectral density tensor of the emitted thermal electromagnetic fields in the near-field regime. Our calculations indicate that, due to time-modulation, spatial coherence can be transferred between different frequencies, and correlations between different frequency components become possible. All these effects are unique to time-modulated systems. We also show that the decay rate of optical emitters can be controlled in the proximity of such time-modulated structure. Our findings open a promising avenue toward coherence control in thermal radiation, dynamical thermal imaging, manipulating energy transfer among thermal or optical emitters, efficient near-field radiative cooling, and engineering spontaneous emission rates of molecules. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.01261v2-abstract-full').style.display = 'none'; document.getElementById('2302.01261v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 130, 096902 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09805">arXiv:2211.09805</a> <span> [<a href="https://arxiv.org/pdf/2211.09805">pdf</a>, <a href="https://arxiv.org/format/2211.09805">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Programmable photonic system for quantum simulation in arbitrary topologies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bartlett%2C+B">Ben Bartlett</a>, <a href="/search/physics?searchtype=author&query=Long%2C+O+Y">Olivia Y. Long</a>, <a href="/search/physics?searchtype=author&query=Dutt%2C+A">Avik Dutt</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.09805v1-abstract-short" style="display: inline;"> Synthetic dimensions have generated great interest for studying many types of topological, quantum, and many-body physics, and they offer a flexible platform for simulation of interesting physical systems, especially in high dimensions. In this Letter, we describe a programmable photonic device capable of emulating the dynamics of a broad class of Hamiltonians in lattices with arbitrary topologies… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09805v1-abstract-full').style.display = 'inline'; document.getElementById('2211.09805v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09805v1-abstract-full" style="display: none;"> Synthetic dimensions have generated great interest for studying many types of topological, quantum, and many-body physics, and they offer a flexible platform for simulation of interesting physical systems, especially in high dimensions. In this Letter, we describe a programmable photonic device capable of emulating the dynamics of a broad class of Hamiltonians in lattices with arbitrary topologies and dimensions. We derive a correspondence between the physics of the device and the Hamiltonians of interest, and we simulate the physics of the device to observe a wide variety of physical phenomena, including chiral states in a Hall ladder, effective gauge potentials, and oscillations in high-dimensional lattices. Our proposed device opens new possibilities for studying topological and many-body physics in near-term experimental platforms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09805v1-abstract-full').style.display = 'none'; document.getElementById('2211.09805v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.05193">arXiv:2211.05193</a> <span> [<a href="https://arxiv.org/pdf/2211.05193">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.107.115406">10.1103/PhysRevB.107.115406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Moving Media as Photonic Heat Engine and Pump </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tsurimaki%2C+Y">Yoichiro Tsurimaki</a>, <a href="/search/physics?searchtype=author&query=Yu%2C+R">Renwen Yu</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.05193v1-abstract-short" style="display: inline;"> A system consisting of two slabs with different temperatures can exhibit a non-equilibrium lateral Casimir force on either one of the slabs when Lorentz reciprocity is broken in at least one of the slabs. This system constitutes a photonic heat engine that converts radiative heat into work done by the non-equilibrium lateral Casimir force. Reversely, by sliding two slabs at a sufficiently high rel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.05193v1-abstract-full').style.display = 'inline'; document.getElementById('2211.05193v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.05193v1-abstract-full" style="display: none;"> A system consisting of two slabs with different temperatures can exhibit a non-equilibrium lateral Casimir force on either one of the slabs when Lorentz reciprocity is broken in at least one of the slabs. This system constitutes a photonic heat engine that converts radiative heat into work done by the non-equilibrium lateral Casimir force. Reversely, by sliding two slabs at a sufficiently high relative velocity, heat is pumped from the slab at a lower temperature to the other one at a higher temperature. Hence the system operates as a photonic heat pump. In this work, we study the thermodynamic performance of such a photonic heat engine and pump via the fluctuational electrodynamics formalism. The propulsion force due to the non-reciprocity and the drag force due to the Doppler effect was revealed as the physical mechanism behind the heat engine. We also show that in the case of the heat pump, the use of nonreciprocal materials can help reduce the required velocity. We present an ideal material dispersion to reach the Carnot efficiency limit. Furthermore, we derive a relativistic version of the thermodynamic efficiency for our heat engine and prove that it is bounded by the Carnot efficiency that is independent of the frame of reference. Our work serves as a conceptual guide for the realization of photonic heat engines based on fluctuating electromagnetic fields and relativistic thermodynamics and shows the important role of electromagnetic non-reciprocity in operating them. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.05193v1-abstract-full').style.display = 'none'; document.getElementById('2211.05193v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 7 figures, and supplementary materials</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16935">arXiv:2210.16935</a> <span> [<a href="https://arxiv.org/pdf/2210.16935">pdf</a>, <a href="https://arxiv.org/format/2210.16935">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Scalable and self-correcting photonic computation using balanced photonic binary tree cascades </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pai%2C+S">Sunil Pai</a>, <a href="/search/physics?searchtype=author&query=Solgaard%2C+O">Olav Solgaard</a>, <a href="/search/physics?searchtype=author&query=Fan%2C+S">Shanhui Fan</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+A+B">David A. B. Miller</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.16935v1-abstract-short" style="display: inline;"> Programmable unitary photonic networks that interfere hundreds of modes are emerging as a key technology in energy-efficient sensing, machine learning, cryptography, and linear optical quantum computing applications. In this work, we establish a theoretical framework to quantify error tolerance and scalability in a more general class of "binary tree cascade'' programmable photonic networks that ac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16935v1-abstract-full').style.display = 'inline'; document.getElementById('2210.16935v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16935v1-abstract-full" style="display: none;"> Programmable unitary photonic networks that interfere hundreds of modes are emerging as a key technology in energy-efficient sensing, machine learning, cryptography, and linear optical quantum computing applications. In this work, we establish a theoretical framework to quantify error tolerance and scalability in a more general class of "binary tree cascade'' programmable photonic networks that accept up to tens of thousands of discrete input modes $N$. To justify this scalability claim, we derive error tolerance and configuration time that scale with $\log_2 N$ for balanced trees versus $N$ in unbalanced trees, despite the same number of total components. Specifically, we use second-order perturbation theory to compute phase sensitivity in each waveguide of balanced and unbalanced networks, and we compute the statistics of the sensitivity given random input vectors. We also evaluate such networks after they self-correct, or self-configure, themselves for errors in the circuit due to fabrication error and environmental drift. Our findings have important implications for scaling photonic circuits to much larger circuit sizes; this scaling is particularly critical for applications such as principal component analysis and fast Fourier transforms, which are important algorithms for machine learning and signal processing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16935v1-abstract-full').style.display = 'none'; document.getElementById('2210.16935v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, 12 figures</span> </p> </li> </ol> <nav class="pagination is-small is-centered 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