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From optical magnetism to second-order spatial dispersion in self-assembled metamaterials
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <!-- Meta Tags --> <meta http-equiv="content-type" content="application/xhtml+xml; charset=utf-8" /> <meta http-equiv="content-language" content="en-ie" /> <meta name="robots" content="index, follow" /> <meta name="description" content="" /> <meta name="keywords" content="" /> <meta name="author" content="Starlight Solutions" /> <!-- Favicon --> <link rel="shortcut icon" href="http://programme.exordo.com/nanop2018/favicon.ico" /> <!-- CSS --> <link rel="stylesheet" type="text/css" href="/nanop2018/css/layout.css" /><link rel="stylesheet" type="text/css" href="/nanop2018/packages/starolas/css/dashboard.css" /><link rel="stylesheet" type="text/css" href="/nanop2018/css/style.css" /> <script type="text/javascript" src="/nanop2018/packages/basics/js/generic.js"></script><script type="text/javascript" src="/nanop2018/packages/starolas/js/jquery.js"></script><script type="text/javascript" src="/nanop2018/packages/basics/js/json2.js"></script> <title>From optical magnetism to second-order spatial dispersion in self-assembled metamaterials</title> </head> <body> <div id="page"> <div id="page_header"> <div id="page_header_banner"> <div class="dates"> <div class="year"> 2018, </div> <div class="days"> 1st - 3rd October </div> </div> <div class="name"> <a href="http://premc.org/conferences/nanop-nanophotonics-micro-nano-optics/" onclick="window.open(this.href,'_blank');return false;">Nanophotonics and Micro/Nano Optics International Conference 2018</a> </div> <div class="description"> <div class="dots"> <a href="http://www.exordo.com" onclick="window.open(this.href,'_blank');return false;"><img src="/nanop2018/img/template/exordo_dots.png" height="22" width="61" alt="Ex Ordo Dots" /></a> </div> <div class="text"> <a href="/nanop2018/dashboard/programme/" >Conference Programme</a> </div> <div class="status"> </div> </div> </div> </div> <div id="page_content"> <div id="page_content_main_container"> <div class="page_content_main"> <script type="text/javascript"> /* <![CDATA[ */ // Show the long version of the abstract function showAbstract(id) { document.getElementById('abstract_short_' + id).style.display = "none"; document.getElementById('abstract_long_' + id).style.display = "block"; return false; } /* ]]> */ </script> <style> h1 { font-size: 18pt; line-height: 32px; margin: 20px 0px 10px; } </style> <div class="delegate__presentation"> <h1>From optical magnetism to second-order spatial dispersion in self-assembled metamaterials</h1> <div class="presenter_and_bio"> <h2>Alexandre Baron</h2> <p> <em>University of Bordeaux</em> </p> <p> Alexandre Baron is an assistant Professor at the University of Bordeaux in France and conducts his research at the Centre de Recherche Paul Pascal. His expertise is in theoretical and experimental optics and currently collaborates closely with nanochemists and soft-matter physical chemists to study the optical properties of self-assembled composite materials. He has worked in the past at the Institute of Optics in Paris and at Duke University at the Center for Metamaterials and Integrated Plasmonics. His research interests are in nonlinear metamaterials and plasmonics, self-assembled metamaterials and disorder in photonic crystal waveguieds. </p> </div> <h2>Abstract</h2> <div id="abstract_short_1"> <p> The magnetic susceptibility of all natural materials is vanishingly small at high frequencies [1]. The metamaterials community has shown that optical magnetism could be realized using top-down fabricated structures, though at... [ <a href="/nanop2018/" onclick="return showAbstract('1');">view full abstract</a> ] </p> </div> <div id="abstract_long_1" style="display:none;"> <p> <p>The magnetic susceptibility of all natural materials is vanishingly small at high frequencies [1]. The metamaterials community has shown that optical magnetism could be realized using top-down fabricated structures, though at the expense of a high degree of anisotropy. We have shown experimentally that isotropic bulk optical magnetism can be produced by self-assembling dense materials made of magnetic meta-atoms composed of spherical plasmonic nanoclusters of well-controlled morphology [2]. These meta-atoms are composed of dielectric cores surrounded by metallic satellites that are either spheres or patches. Our bottom-up hierarchical approach permits the chemical synthesis of meta-atoms with tailored magnetic dipole moments characterized by polarization-resolved static light scattering spectroscopy, followed by microfluidic assembly of dense metamaterials that exhibit a resonance of the magnetic permeability at optical frequencies, characterized by variable–angle spectroscopic ellipsometry. Numerical simulations guide all our investigations. Figure 1(a-d) are scanning electron micrographs of the assembled metamaterial arranged into microfluidic channels. Figure 1(e) shows the experimental measurement of the real part of the magnetic permeability in the visible regime.</p><p> </p><p>The magnetism observed arises from circulating polarization currents within the meta-atom analogous to atomic circulating currents that arise from the angular momentum of the orbiting electron in the classical picture. This magnetic response originates from second-order spatial dispersion and is only valid in the case of divergent-free solutions (when the divergence of the electric field is null). </p><p>A full description of the optical properties of our metamaterials actually requires taking the locally non-zero divergence of the electric-field into account. This description requires three electromagnetic parameters. </p><p>In this talk, we shall review the realizations of optical magnetism based on the bottom-up approach of material chemistry and describe the emergence of a third nonlocal parameter required to fully describe our metamaterials. </p><p> [1] L. D. Landau and E.M. Lifshitz. Electrodynamics of Continuous Media, Pergamon Press. Oxford, 1960.</p><p> [2] S. Gomez-Grana, A. Le Beulze, …, A. Baron, D. Torrent, and P. Barois, “Hierarchical self-assembly of a bulk metamaterial enables isotropic magnetic permeability at optical frequencies”, <em>Materials Horizons</em>, <em>3</em>(6), 596-601 (2016).</p> </p> </div> <h2>Authors</h2> <ol> <li> <u>Alexandre Baron</u> (University of Bordeaux) </li> <li> Quentin Flamant (University of Bordeaux) </li> <li> Philippe Richetti (University of Bordeaux) </li> <li> Serge Ravaine (University of Bordeaux) </li> <li> Virginie Ponsinet (University of Bordeaux) </li> <li> Philippe Barois (University of Bordeaux) </li> <li> Veronique Many (University of Bordeaux) </li> <li> Etienne Duguet (University of Bordeaux) </li> <li> Mona Treguer-delapierre (University of Bordeaux) </li> <li> Sara De Cicco (University of Bordeaux) </li> <li> Jean-baptiste Salmon (University of Bordeaux) </li> <li> Jacques Leng (University of Bordeaux) </li> </ol> <h2>Topic Areas</h2> <p> Photonic & plasmonic nanomaterials , Optical properties of nanostructures , Metamaterials </p> <h2>Session</h2> <p> OS1b-A » <a href="/nanop2018/delegates/session/11/" >Metamaterials</a> (17:05 - Monday, 1st October, AUDITORIUM) </p> <div class="presentation_files"> <h2>Presentation Files</h2> <p>The presenter has not uploaded any presentation files. </p> </div> </div> </div> </div> <div id="page_content_side_container"> <div class="page_content_side"> <div class="menu"> </div> </div> </div> <div class="clear"> </div> </div> <div id="page_footer"> <div id="page_footer_container"> <div class="links"> <a href="mailto:support@exordo.com" >Email Support</a> • <a href="https://www.exordo.com/blog/" onclick="window.open(this.href,'_blank');return false;">Blog</a> • <a href="https://www.exordo.com/legal/data-protection-and-privacy-policy" onclick="window.open(this.href,'_blank');return false;">Privacy Policy</a> • <a href="/nanop2018/cancellation-policy" >Cancellation Policy</a> </div> <div class="powered_by"> <div class="pb"> powered by </div> <div class="exordo"> <a href="http://www.exordo.com" onclick="window.open(this.href,'_blank');return false;"><img src="/nanop2018/img/template/exordo_logo.png" height="24" width="121" alt="Ex Ordo" /></a> </div> </div> </div> </div> </div> <div class="url" style="display: none; text-indent: -999em;">http://programme.exordo.com/nanop2018/system/is_sync/</div> <script type="text/javascript" src="/nanop2018/packages/starolas/js/is_syncing.js"></script> </body> </html>