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gap</title> <meta name="description" content="Search results for: optical band gap"> <meta name="keywords" content="optical band gap"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="optical band gap"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 2540</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: optical band gap</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2540</span> Many-Body Effect on Optical Gain of n+ Doping Tensile-Strained Ge/GeSiSn Quantum Wells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=W.%20J.%20Fan">W. J. Fan</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20S.%20Ma"> B. S. Ma</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The many-body effect on band structure and optical gain of n+ doping tensile-strained Ge/GeSiSn quantum wells are investigated by using an 8-band k•p method. Phase diagram of Ge/GeSiSn quantum well is obtained. The E-k dispersion curves, band gap renormalization and optical gain spectra including many-body effect will be calculated and discussed. We find that the k.p method without many-body effect will overestimate the optical gain and transition energy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Si%20photonics" title="Si photonics">Si photonics</a>, <a href="https://publications.waset.org/abstracts/search?q=many-body%20effect" title=" many-body effect"> many-body effect</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20gain" title=" optical gain"> optical gain</a>, <a href="https://publications.waset.org/abstracts/search?q=Ge-on-Si" title=" Ge-on-Si"> Ge-on-Si</a>, <a href="https://publications.waset.org/abstracts/search?q=Quantum%20well" title=" Quantum well"> Quantum well</a> </p> <a href="https://publications.waset.org/abstracts/13799/many-body-effect-on-optical-gain-of-n-doping-tensile-strained-gegesisn-quantum-wells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13799.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">734</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2539</span> Effect of Manganese Doping Percentage on Optical Band Gap and Conductivity of Copper Sulphide Nano-Films Prepared by Electrodeposition Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=P.%20C.%20Okafor">P. C. Okafor</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20J.%20Ekpunobi"> A. J. Ekpunobi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Mn doped copper sulphide (CuS:Mn) nano-films were deposited on indiums coated tin oxide (ITO) glass substrates using electrodeposition method. Electrodeposition was carried out using bath of PH = 3 at room temperature. Other depositions parameters such as deposition time (DT) are kept constant while Mn doping was varied from 3% to 23%. Absorption spectra of CuS:Mn films was obtained by using JENWAY 6405 UV-VIS -spectrophotometer. Optical band gap (E_g ), optical conductivity (σo) and electrical conductivity (σe) of CuS:Mn films were determined using absorption spectra and appropriate formula. The effect of Mn doping % on these properties were investigated. Results show that film thickness (t) for the 13.27 nm to 18.49 nm; absorption coefficient (α) from 0.90 x 1011 to 1.50 x 1011 optical band gap from 2.29eV to 2.35 eV; optical conductivity from 1.70 x 1013 and electrical conductivity from 160 millions to 154 millions. Possible applications of such films for solar cells fabrication and optoelectronic devices applications were also discussed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=copper%20sulphide%20%28CuS%29" title="copper sulphide (CuS)">copper sulphide (CuS)</a>, <a href="https://publications.waset.org/abstracts/search?q=Manganese%20%28Mn%29%20doping" title=" Manganese (Mn) doping"> Manganese (Mn) doping</a>, <a href="https://publications.waset.org/abstracts/search?q=electrodeposition" title=" electrodeposition"> electrodeposition</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20band%20gap" title=" optical band gap"> optical band gap</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20conductivity" title=" optical conductivity"> optical conductivity</a>, <a href="https://publications.waset.org/abstracts/search?q=electrical%20conductivity" title=" electrical conductivity"> electrical conductivity</a> </p> <a href="https://publications.waset.org/abstracts/19832/effect-of-manganese-doping-percentage-on-optical-band-gap-and-conductivity-of-copper-sulphide-nano-films-prepared-by-electrodeposition-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19832.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">722</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2538</span> Multi-Band Frequency Conversion Scheme with Multi-Phase Shift Based on Optical Frequency Comb</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tao%20Lin">Tao Lin</a>, <a href="https://publications.waset.org/abstracts/search?q=Shanghong%20Zhao"> Shanghong Zhao</a>, <a href="https://publications.waset.org/abstracts/search?q=Yufu%20Yin"> Yufu Yin</a>, <a href="https://publications.waset.org/abstracts/search?q=Zihang%20Zhu"> Zihang Zhu</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Jiang"> Wei Jiang</a>, <a href="https://publications.waset.org/abstracts/search?q=Xuan%20Li"> Xuan Li</a>, <a href="https://publications.waset.org/abstracts/search?q=Qiurong%20Zheng"> Qiurong Zheng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A simple operated, stable and compact multi-band frequency conversion and multi-phase shift is proposed to satisfy the demands of multi-band communication and radar phase array system. The dual polarization quadrature phase shift keying (DP-QPSK) modulator is employed to support the LO sideband and the optical frequency comb simultaneously. Meanwhile, the fiber is also used to introduce different phase shifts to different sidebands. The simulation result shows that by controlling the DC bias voltages and a C band microwave signal with frequency of 4.5 GHz can be simultaneously converted into other signals that cover from C band to K band with multiple phases. It also verifies that the multi-band and multi-phase frequency conversion system can be stably performed based on current manufacturing art and can well cope with the DC drifting. It should be noted that the phase shift of the converted signal also partly depends of the length of the optical fiber. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=microwave%20photonics" title="microwave photonics">microwave photonics</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-band%20frequency%20conversion" title=" multi-band frequency conversion"> multi-band frequency conversion</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-phase%20shift" title=" multi-phase shift"> multi-phase shift</a>, <a href="https://publications.waset.org/abstracts/search?q=conversion%20efficiency" title=" conversion efficiency"> conversion efficiency</a> </p> <a href="https://publications.waset.org/abstracts/96199/multi-band-frequency-conversion-scheme-with-multi-phase-shift-based-on-optical-frequency-comb" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/96199.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">254</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2537</span> Optical and Dielectric Properties of Self-Assembled 0D Hybrid Organic-Inorganic Insulator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Kassou">S. Kassou</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20El%20Mrabet"> R. El Mrabet</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Belaaraj"> A. Belaaraj</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20Guionneau"> P. Guionneau</a>, <a href="https://publications.waset.org/abstracts/search?q=N.%20Hadi"> N. Hadi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lamcharfi"> T. Lamcharfi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The organic–inorganic hybrid perovskite-like [C<sub>6</sub>H<sub>5</sub>C<sub>2</sub>H<sub>4</sub>NH<sub>3</sub>]<sub>2</sub>ZnCl<sub>4</sub> (PEA-ZnCl<sub>4</sub>) was synthesized by saturated solutions method. X-ray powder diffraction, Raman spectroscopy, UV-visible transmittance, and capacitance meter measurements have been used to characterize the structure, the functional groups, the optical parameters, and the dielectric constants of the material. The material has a layered structure. The optical transmittance (T %) was recorded and applied to deduce the absorption coefficient (α) and optical band gap (Eg). The hybrid shows an insulator character with a direct band gap about 4.46 eV, and presents high dielectric constants up to a frequency of about 10<sup>5</sup> Hz, which suggests a ferroelectric behavior. The reported optical and dielectric properties can help to understand the fundamental properties of perovskite materials and also to be used for optimizing or designing new devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dielectric%20constants" title="dielectric constants">dielectric constants</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20band%20gap%20%28eg%29" title=" optical band gap (eg)"> optical band gap (eg)</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20parameters" title=" optical parameters"> optical parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=Raman%20spectroscopy" title=" Raman spectroscopy"> Raman spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=self-assembly%20organic%20inorganic%20hybrid" title=" self-assembly organic inorganic hybrid"> self-assembly organic inorganic hybrid</a> </p> <a href="https://publications.waset.org/abstracts/65237/optical-and-dielectric-properties-of-self-assembled-0d-hybrid-organic-inorganic-insulator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/65237.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">404</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2536</span> Optical Bands Splitting in Tm₃Fe₅O₁₂ Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=R.%20Vidyasagar">R. Vidyasagar</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20L.%20S.%20Vilela"> G. L. S. Vilela</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20M.%20Guiraldelli"> B. M. Guiraldelli</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20B.%20Henriques"> A. B. Henriques</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20%20Moodera"> J. Moodera</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nano-scaled magnetic systems that can have both magnetic and optical transitions controlled and manipulated by external means have received enormous research attention for their potential applications in magneto-optics and spintronic devices. Among several ferrimagnetic insulators, the Tm₃Fe₅O₁₂ (TmIG) has become a prototype material displaying huge perpendicular magnetic anisotropy. Nevertheless, the optical properties of nano-scale TnIG films have not yet been investigated. We report the observation of giant splitting in the optical transitions of high-quality thin films of Tm₃Fe₅O₁₂ (TmIG) grown by rf sputtering on gadolinium gallium garnet substrates (GGG-111) substrate. The optical absorbance profiles measured with optical absorption spectroscopy show a dual optical transition in visible frequency regimes attributed to the transitions of electrons from the O-2p valence band to the Fe-3d conduction band and from the O-2p valence band to the Fe-2p⁵3d⁶ excitonic states at the Γ-symmetric point of the TmIG Brillouin zone. When the thickness of the film is reduced from 120 nm to 7.5 nm, the 1st optical transition energy shifted from 2.98 to 3.11 eV ( ~130 meV), and the 2nd transition energy shifted from 2.62 to 2.56 eV (~ 60 meV). The giant band splitting of both transitions can be attributed to the population of excited states associated with the atomic modification pertaining to the compressive or tensile strains. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optical%20transitions" title="optical transitions">optical transitions</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20films" title=" thin films"> thin films</a>, <a href="https://publications.waset.org/abstracts/search?q=ferrimagnetic%20insulator" title=" ferrimagnetic insulator"> ferrimagnetic insulator</a>, <a href="https://publications.waset.org/abstracts/search?q=strains" title=" strains"> strains</a> </p> <a href="https://publications.waset.org/abstracts/186490/optical-bands-splitting-in-tm3fe5o12-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/186490.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">49</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2535</span> Electronic and Optical Properties of Orthorhombic NdMnO3 with the Modified Becke-Johnson Potential</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=B.%20Bouadjemi">B. Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lantri"> T. Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Abbad"> A. Abbad</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Zitouni"> A. Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the electronic structure, magnetic and optical properties of the orthorhombic NdMnO3 through density-functional-theory (DFT) calculations using both generalized gradient approximation GGA and GGA+U approaches, the exchange and correlation effects are taken into account by an orbital independent modified Becke Johnson (MBJ). The predicted band gaps using the MBJ exchange approximation show a significant improvement over previous theoretical work with the common GGA and GGA+U very closer to the experimental results. Band gap dependent optical parameters like dielectric constant, index of refraction, absorption coefficient, reflectivity and conductivity are calculated and analyzed. We find that when using MBJ we have obtained better results for band gap of NdMnO3 than in the case of GGA and GGA+U. The values of band gap founded in this work by MBJ are in a very good agreement with corresponding experimental values compared to other calculations. This comprehensive theoretical study of the optoelectronic properties predicts that this material can be effectively used in optical devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=DFT" title="DFT">DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties" title=" optical properties"> optical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=absorption%20coefficient" title=" absorption coefficient"> absorption coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=strong%20correlation" title=" strong correlation"> strong correlation</a>, <a href="https://publications.waset.org/abstracts/search?q=MBJ" title=" MBJ"> MBJ</a>, <a href="https://publications.waset.org/abstracts/search?q=orthorhombic%20NdMnO3" title=" orthorhombic NdMnO3"> orthorhombic NdMnO3</a>, <a href="https://publications.waset.org/abstracts/search?q=optoelectronic" title=" optoelectronic"> optoelectronic</a> </p> <a href="https://publications.waset.org/abstracts/15712/electronic-and-optical-properties-of-orthorhombic-ndmno3-with-the-modified-becke-johnson-potential" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15712.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">909</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2534</span> Physicochemical and Optical Characterization of Rutile TiO2 Thin Films Grown by APCVD Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dalila%20Hocine">Dalila Hocine</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Said%20Belkaid"> Mohammed Said Belkaid</a>, <a href="https://publications.waset.org/abstracts/search?q=Abderahmane%20Moussi"> Abderahmane Moussi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, pure rutile TiO2 thin films were directly synthesized on silicon substrates by Atmospheric Pressure Chemical Vapor Deposition technique (APCVD) using TiCl4 as precursor. We studied the physicochemical properties and the optical properties of the produced coatings by means of standard characterization techniques of Fourier Transform Infrared Spectroscopy (FTIR) combined with UV-Vis Reflectance Spectrophotometry. The absorption peaks at 423 cm-1 and 610 cm-1 were observed for the rutile TiO2 thin films, by FTIR measurements. The absorption peak at 739 cm-1 due to the vibration of the Ti-O bonds, was also detected. UV-Vis Reflectance Spectrophotometry is employed for measuring the optical band gap from the measurements of the TiO2 films reflectance. The optical band gap was then extracted from the reflectance data for the TiO2 sample. It was estimated to be 3.05 eV which agrees with the band gap of commercial rutile TiO2 sample. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=titanium%20dioxide" title="titanium dioxide">titanium dioxide</a>, <a href="https://publications.waset.org/abstracts/search?q=physicochemical%20properties" title=" physicochemical properties"> physicochemical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=APCVD" title=" APCVD"> APCVD</a>, <a href="https://publications.waset.org/abstracts/search?q=FTIR" title=" FTIR"> FTIR</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20gap" title=" band gap"> band gap</a> </p> <a href="https://publications.waset.org/abstracts/27069/physicochemical-and-optical-characterization-of-rutile-tio2-thin-films-grown-by-apcvd-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27069.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">396</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2533</span> Influence of Thickness on Optical Properties of ZnO Thin Films Prepared by Radio Frequency (RF) Sputtering Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Abdullahi">S. Abdullahi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Momoh"> M. Momoh</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20U.%20Isah"> K. U. Isah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Zinc oxide (ZnO) thin films of 75.5 nm and 130.5 nm were deposited at room temperature onto chemically and ultrasonically cleaned corning glass substrate by radio frequency technique and annealed at 150°C under nitrogen atmosphere for 60 minutes. The optical properties of the films were ascertained by UV-VIS-NIR spectrophotometry. Influence of the thickness of the films on the optical properties was studied keeping other deposition parameters constant. The optical transmittance spectra reveal a maximum transmittance of 81.49% and 84.26% respectively. The band gap of the films is found to be direct allowed transition and decreases with the increase in thickness of the films. The band gap energy (Eg) is in the range of 3.28 eV to 3.31 eV, respectively. These thin films are suitable for solar cell applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optical%20constants" title="optical constants">optical constants</a>, <a href="https://publications.waset.org/abstracts/search?q=RF%20sputtering" title=" RF sputtering"> RF sputtering</a>, <a href="https://publications.waset.org/abstracts/search?q=Urbach%20energy" title=" Urbach energy"> Urbach energy</a>, <a href="https://publications.waset.org/abstracts/search?q=zinc%20oxide%20thin%20film" title=" zinc oxide thin film"> zinc oxide thin film</a> </p> <a href="https://publications.waset.org/abstracts/10863/influence-of-thickness-on-optical-properties-of-zno-thin-films-prepared-by-radio-frequency-rf-sputtering-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/10863.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">457</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2532</span> Comparative Study of Electronic and Optical Properties of Ammonium and Potassium Dinitramide Salts through Ab-Initio Calculations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=J.%20Prathap%20Kumar">J. Prathap Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20Vaitheeswaran"> G. Vaitheeswaran</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present study investigates the role of ammonium and potassium ion in the electronic, bonding and optical properties of dinitramide salts due to their stability and non-toxic nature. A detailed analysis of bonding between NH₄ and K with dinitramide, optical transitions from the valence band to the conduction band, absorption spectra, refractive indices, reflectivity, loss function are reported. These materials are well known as oxidizers in solid rocket propellants. In the present work, we use full potential linear augmented plane wave (FP-LAPW) method which is implemented in the Wien2k package within the framework of density functional theory. The standard DFT functional local density approximation (LDA) and generalized gradient approximation (GGA) always underestimate the band gap by 30-40% due to the lack of derivative discontinuities of the exchange-correlation potential with respect to an occupation number. In order to get reliable results, one must use hybrid functional (HSE-PBE), GW calculations and Tran-Blaha modified Becke-Johnson (TB-mBJ) potential. It is very well known that hybrid functionals GW calculations are very expensive, the later methods are computationally cheap. The new developed TB-mBJ functionals use information kinetic energy density along with the charge density employed in DFT. The TB-mBJ functionals cannot be used for total energy calculations but instead yield very much improved band gap. The obtained electronic band gap at gamma point for both the ammonium dinitramide and potassium dinitramide are found to be 2.78 eV and 3.014 eV with GGA functional, respectively. After the inclusion of TB-mBJ, the band gap improved by 4.162 eV for potassium dinitramide and 4.378 eV for ammonium dinitramide. The nature of the band gap is direct in ADN and indirect in KDN. The optical constants such as dielectric constant, absorption, and refractive indices, birefringence values are presented. Overall as there are no experimental studies we present the improved band gap with TB-mBJ functional following with optical properties. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ammonium%20dinitramide" title="ammonium dinitramide">ammonium dinitramide</a>, <a href="https://publications.waset.org/abstracts/search?q=potassium%20dinitramide" title=" potassium dinitramide"> potassium dinitramide</a>, <a href="https://publications.waset.org/abstracts/search?q=DFT" title=" DFT"> DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=propellants" title=" propellants"> propellants</a> </p> <a href="https://publications.waset.org/abstracts/94164/comparative-study-of-electronic-and-optical-properties-of-ammonium-and-potassium-dinitramide-salts-through-ab-initio-calculations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/94164.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">157</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2531</span> An ab initioStudy of the Structural, Elastic, Electronic, and Optical Properties of the Perovskite ScRhO3</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=L.%20Foudia">L. Foudia</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Haddadi"> K. Haddadi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Reffas"> M. Reffas</a> </p> <p class="card-text"><strong>Abstract:</strong></p> First principles study of structural, elastic, electronic and optical properties of the monoclinic perovskite type ScRhO₃ has been reported using the pseudo-potential plane wave method within the local density approximation. The calculated lattice parameters, including the lattice constants and angle β, are in excellent agreement with the available experimental data, which proving the reliability of the chosen theoretical approach. Pressure dependence up to 20 GPa of the single crystal and polycrystalline elastic constants has been investigated in details using the strain-stress approach. The mechanical stability, ductility, average elastic wave velocity, Debye temperature and elastic anisotropy were also assessed. Electronic band structure and density of states (DOS) demonstrated its semiconducting nature showing a direct band gap of 1.38 eV. Furthermore, several optical properties, such as absorption coefficient, reflectivity, refractive index, dielectric function, optical conductivity and electron energy loss function, have been calculated for radiation up to 40 eV. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ab-initio" title="ab-initio">ab-initio</a>, <a href="https://publications.waset.org/abstracts/search?q=perovskite" title=" perovskite"> perovskite</a>, <a href="https://publications.waset.org/abstracts/search?q=DFT" title=" DFT"> DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20gap" title=" band gap"> band gap</a> </p> <a href="https://publications.waset.org/abstracts/167855/an-ab-initiostudy-of-the-structural-elastic-electronic-and-optical-properties-of-the-perovskite-scrho3" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167855.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">80</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2530</span> 55 dB High Gain L-Band EDFA Utilizing Single Pump Source</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20H.%20Al-Mansoori">M. H. Al-Mansoori</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20S.%20Al-Ghaithi"> W. S. Al-Ghaithi</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20N.%20Hasoon"> F. N. Hasoon</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we experimentally investigate the performance of an efficient high gain triple-pass L-band Erbium-Doped Fiber (EDF) amplifier structure with a single pump source. The amplifier gain and noise figure variation with EDF pump power, input signal power and wavelengths have been investigated. The generated backward Amplified Spontaneous Emission (ASE) noise of the first amplifier stage is suppressed by using a tunable band-pass filter. The amplifier achieves a signal gain of 55 dB with low noise figure of 3.8 dB at -50 dBm input signal power. The amplifier gain shows significant improvement of 12.8 dB compared to amplifier structure without ASE suppression. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optical%20amplifiers" title="optical amplifiers">optical amplifiers</a>, <a href="https://publications.waset.org/abstracts/search?q=EDFA" title=" EDFA"> EDFA</a>, <a href="https://publications.waset.org/abstracts/search?q=L-band" title=" L-band"> L-band</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20networks" title=" optical networks"> optical networks</a> </p> <a href="https://publications.waset.org/abstracts/11110/55-db-high-gain-l-band-edfa-utilizing-single-pump-source" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11110.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">349</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2529</span> Modeling Thermo-Photo-Voltaic Selective Emitter Based on a Semi-Transparent Emitter with Integrated Narrow Band-Pass Pre-Filter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Stake">F. Stake</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work is a parametric study combining simple and well known optical theories. These simple theories are arranged to form part of one answer to the question: “Can a semi-transparent Thermo-Photo-Voltaic (TPV) emitter have an optical extinction spectrum so much greater than its optical absorption spectrum that it becomes its own band-pass pre-filter, and if so, how well might it be expected to suppress light of undesired wavelengths?” In the report, hypothetical materials and operating temperatures will be used for comparative analyses only. Thermal emission properties of these hypothetical materials were created using two openly available FORTRAN programs. Results indicate that if using highly transparent materials it may be possible to create a thermal emitter that is its own band-pass pre-filter. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Christensen%20effect" title="Christensen effect">Christensen effect</a>, <a href="https://publications.waset.org/abstracts/search?q=DISORT" title=" DISORT"> DISORT</a>, <a href="https://publications.waset.org/abstracts/search?q=index%20of%20refraction" title=" index of refraction"> index of refraction</a>, <a href="https://publications.waset.org/abstracts/search?q=scattering" title=" scattering"> scattering</a> </p> <a href="https://publications.waset.org/abstracts/107267/modeling-thermo-photo-voltaic-selective-emitter-based-on-a-semi-transparent-emitter-with-integrated-narrow-band-pass-pre-filter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/107267.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">119</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2528</span> Investigation of Thickness Dependent Optical Properties of Bi₂Sb(₃-ₓ):Te ₓ (where x = 0.1, 0.2, 0.3) Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Reena%20Panchal">Reena Panchal</a>, <a href="https://publications.waset.org/abstracts/search?q=Maunik%20Jani"> Maunik Jani</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20M.%20Vyas"> S. M. Vyas</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20R.%20Pandya"> G. R. Pandya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Group V-VI compounds have a narrow bandgap, which makes them useful in many electronic devices. In bulk form, BiSbTe alloys are semi-metals or semi-conductors. They are used in thermoelectric and thermomagnetic devices, fabrication of ionizing, radiation detectors, LEDs, solid-state electrodes, photosensitive heterostructures, solar cells, ionic batteries, etc. Thin films of Bi₂Sb(₃-ₓ):Tex (where x = 0.1, 0.2, 0.3) of various thicknesses were grown by the thermal evaporation technique on a glass substrate at room temperature under a pressure of 10-₄ mbar for different time periods such as 10s, 15s, and 20s. The thickness of these thin films was also obtained by using the swaneopeol envelop method and compared those values with instrumental values. The optical absorption (%) data of thin films was measured in the wave number range of 650 cm-¹ to 4000 cm-¹. The band gap has been evaluated from these optical absorption data, and the results indicate that absorption occurred by a direct interband transition. It was discovered that when thickness decreased, the band gap increased; this dependency was inversely related to the square of thickness, which is explained by the quantum size effect. Using the values of bandgap, found the values of optical electronegativity (∆χ) and optical refractive index (η) using various relations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thin%20films" title="thin films">thin films</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20gap" title=" band gap"> band gap</a>, <a href="https://publications.waset.org/abstracts/search?q=film%20thickness" title=" film thickness"> film thickness</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20study" title=" optical study"> optical study</a>, <a href="https://publications.waset.org/abstracts/search?q=size%20effect" title=" size effect"> size effect</a> </p> <a href="https://publications.waset.org/abstracts/190143/investigation-of-thickness-dependent-optical-properties-of-bi2sb3-te-where-x-01-02-03-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/190143.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">18</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2527</span> Theoretical Investigation of the Structural, Electronic, Optical and Elastic Properties of the Perovskite ScRhO₃</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=L.%20Foudia">L. Foudia</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Haddadi"> K. Haddadi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Reffas"> M. Reffas</a> </p> <p class="card-text"><strong>Abstract:</strong></p> First principles study of structural, elastic, electronic and optical properties of the monoclinic perovskite type ScRhO₃ has been reported using the pseudo-potential plane wave method within the local density approximation. The calculated lattice parameters, including the lattice constants and angle β are in excellent agreement with the available experimental data, which proving the reliability of the chosen theoretical approach. Pressure dependence up to 20 GPa of the single crystal and polycrystalline elastic constants has been investigated in details using the strain-stress approach. The mechanical stability, ductility, average elastic wave velocity, Debye temperature and elastic anisotropy were also assessed. Electronic band structure and density of states (DOS) demonstrated its semiconducting nature showing a direct band gap of 1.38 eV. Furthermore, several optical properties, such as absorption coefficient, reflectivity, refractive index, dielectric function, optical conductivity and electron energy loss function have been calculated for radiation up to 40 eV. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ab-initio" title="ab-initio">ab-initio</a>, <a href="https://publications.waset.org/abstracts/search?q=perovskite" title=" perovskite"> perovskite</a>, <a href="https://publications.waset.org/abstracts/search?q=DFT" title=" DFT"> DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20gap." title=" band gap."> band gap.</a> </p> <a href="https://publications.waset.org/abstracts/167906/theoretical-investigation-of-the-structural-electronic-optical-and-elastic-properties-of-the-perovskite-scrho3" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167906.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">74</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2526</span> First Principle Study of Electronic and Optical Properties of YNi₄Si-Type HoNi₄Si Compound</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20K.%20Maurya">D. K. Maurya</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20M.%20Saini"> S. M. Saini</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate theoretically the electronic and optical properties of YNi₄Si-type HoNi₄Si compound from first principle calculations. Calculations are performed using full-potential augmented plane wave (FPLAPW) method in the frame work of density functional theory (DFT). The Coulomb corrected local-spin density approximation (LSDA+U) in the self-interaction correction (SIC) has been used for exchange-correlation potential. Analysis of the calculated band structure of HoNi₄Si compound demonstrates their metallic character. We found Ni-3d states mainly contribute to density of states from -5.0 eV to the Fermi level while the Ho-f states peak stands tall in comparison to the small contributions made by the Ni-d and Ho-d states above Fermi level, which is consistent with experiment, in HoNi4Si compound. Our calculated optical conductivity compares well with the experimental data and the results are analyzed in the light of band to band transitions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electronic%20properties" title="electronic properties">electronic properties</a>, <a href="https://publications.waset.org/abstracts/search?q=density%20of%20states" title=" density of states"> density of states</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties" title=" optical properties"> optical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=LSDA%2BU%20approximation" title=" LSDA+U approximation"> LSDA+U approximation</a>, <a href="https://publications.waset.org/abstracts/search?q=YNi%E2%82%84Si-type%20HoNi4Si%20compound" title=" YNi₄Si-type HoNi4Si compound"> YNi₄Si-type HoNi4Si compound</a> </p> <a href="https://publications.waset.org/abstracts/70023/first-principle-study-of-electronic-and-optical-properties-of-yni4si-type-honi4si-compound" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/70023.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">245</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2525</span> Nonlinear Absorption and Scattering in Wide Band Gap Silver Sulfide Nanoparticles Colloid and Their Effects on the Optical Limiting</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hoda%20Aleali">Hoda Aleali</a>, <a href="https://publications.waset.org/abstracts/search?q=Nastran%20Mansour"> Nastran Mansour</a>, <a href="https://publications.waset.org/abstracts/search?q=Maryam%20Mirzaie"> Maryam Mirzaie</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we study the optical nonlinearities of Silver sulfide (Ag2S) nanostructures dispersed in the Dimethyl sulfoxide (DMSO) under exposure to 532 nm, 15 nanosecond (ns) pulsed laser irradiation. Ultraviolet–visible absorption spectrometry (UV-Vis), X-ray diffraction (XRD), and transmission electron microscopy (TEM) are used to characterize the obtained nanocrystal samples. The band gap energy of colloid is determined by analyzing the UV–Vis absorption spectra of the Ag2S NPs using the band theory of semiconductors. Z-scan technique is used to characterize the optical nonlinear properties of the Ag2S nanoparticles (NPs). Large enhancement of two photon absorption effect is observed with increase in concentration of the Ag2S nanoparticles using open Z-scan measurements in the ns laser regime. The values of the nonlinear absorption coefficients are determined based on the local nonlinear responses including two photon absorption. The observed aperture dependence of the Ag2S NP limiting performance indicates that the nonlinear scattering plays an important role in the limiting action of the sample.The concentration dependence of the optical liming is also investigated. Our results demonstrate that the optical limiting threshold decreases with increasing the silver sulfide NPs in DMSO. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nanoscale%20materials" title="nanoscale materials">nanoscale materials</a>, <a href="https://publications.waset.org/abstracts/search?q=silver%20sulfide%20nanoparticles" title=" silver sulfide nanoparticles"> silver sulfide nanoparticles</a>, <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20absorption" title=" nonlinear absorption"> nonlinear absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20scattering" title=" nonlinear scattering"> nonlinear scattering</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20limiting" title=" optical limiting "> optical limiting </a> </p> <a href="https://publications.waset.org/abstracts/13234/nonlinear-absorption-and-scattering-in-wide-band-gap-silver-sulfide-nanoparticles-colloid-and-their-effects-on-the-optical-limiting" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13234.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">396</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2524</span> Some Fundamental Physical Properties of BiGaO₃ Cubic Perovskite</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=B.%20Gueridi">B. Gueridi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Chihi"> T. Chihi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Fatmi"> M. Fatmi</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Faci"> A. Faci</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Some fundamental physical properties of BiGaO₃ were investigated under pressure and temperature effect using generalized gradient approximation and local density approximation approaches. The effect of orientation on Debye temperature and sound waves velocities were estimated from elastic constants. The value of the bulk modulus of BiGaO₃ is a sign of its high hardness because it is linked to an isotropic deformation. BiGaO₃ is a semiconductor and ductile material with covalent bonding (Ga–O), and the Bi-O bonding is ionic. The optical transitions were observed when electrons pass from the top of the valence band (O-2p) to the bottom of the conduction band (Ga-4p or Bi-6p). The thermodynamic parameters are determined in temperature and pressure ranging from 0 to 1800 K and 0 to 50 GPa. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=BiGaO%E2%82%83%20perovskite" title="BiGaO₃ perovskite">BiGaO₃ perovskite</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20absorption" title=" optical absorption"> optical absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=first%20principle" title=" first principle"> first principle</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20structure" title=" band structure"> band structure</a> </p> <a href="https://publications.waset.org/abstracts/157896/some-fundamental-physical-properties-of-bigao3-cubic-perovskite" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/157896.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">127</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2523</span> Step Height Calibration Using Hamming Window: Band-Pass Filter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dahi%20Ghareab%20Abdelsalam%20Ibrahim">Dahi Ghareab Abdelsalam Ibrahim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Calibration of step heights with high accuracy is needed for many applications in the industry. In general, step height consists of three bands: pass band, transition band (roll-off), and stop band. Abdelsalam used a convolution of the transfer functions of both Chebyshev type 2 and elliptic filters with WFF of the Fresnel transform in the frequency domain for producing a steeper roll-off with the removal of ripples in the pass band- and stop-bands. In this paper, we used a new method based on the Hamming window: band-pass filter for calibration of step heights in terms of perfect adjustment of pass-band, roll-off, and stop-band. The method is applied to calibrate a nominal step height of 40 cm. The step height is measured first by asynchronous dual-wavelength phase-shift interferometry. The measured step height is then calibrated by the simulation of the Hamming window: band-pass filter. The spectrum of the simulated band-pass filter is simulated at N = 881 and f0 = 0.24. We can conclude that the proposed method can calibrate any step height by adjusting only two factors which are N and f0. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=optical%20metrology" title="optical metrology">optical metrology</a>, <a href="https://publications.waset.org/abstracts/search?q=step%20heights" title=" step heights"> step heights</a>, <a href="https://publications.waset.org/abstracts/search?q=hamming%20window" title=" hamming window"> hamming window</a>, <a href="https://publications.waset.org/abstracts/search?q=band-pass%20filter" title=" band-pass filter"> band-pass filter</a> </p> <a href="https://publications.waset.org/abstracts/168134/step-height-calibration-using-hamming-window-band-pass-filter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/168134.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">83</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2522</span> Electronic and Optical Properties of Li₂S Antifluorite Material</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Brahim%20Bahloul">Brahim Bahloul</a>, <a href="https://publications.waset.org/abstracts/search?q=Khatir%20Babesse"> Khatir Babesse</a>, <a href="https://publications.waset.org/abstracts/search?q=Azzedine%20Dkhira"> Azzedine Dkhira</a>, <a href="https://publications.waset.org/abstracts/search?q=Yacine%20Bahloul"> Yacine Bahloul</a>, <a href="https://publications.waset.org/abstracts/search?q=Dalila%20Hammoutene"> Dalila Hammoutene</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we investigate with ab initio calculations some structural and optoelectronic properties of Li₂S compound. The structural and electronic properties of the Li₂S antifluorite structure have been studied by first-principles calculations within the density functional theory (DFT), whereas the optical properties have been obtained using empirical relationships such as the modified Moss relation. Our calculated lattice parameters are in good agreement with the experimental data and other theoretical calculations. The electronic band structures and density of states were obtained. The anti-fluorite Li₂S present an indirect band gap of 3.388 eV at equilibrium. The top of the valence bands reflects the p electronic character for both structures. The calculated energy gaps and optical constants are in good agreement with experimental measurements. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ab%20initio%20calculations" title="Ab initio calculations">Ab initio calculations</a>, <a href="https://publications.waset.org/abstracts/search?q=antifluorite" title=" antifluorite"> antifluorite</a>, <a href="https://publications.waset.org/abstracts/search?q=electronic%20properties" title=" electronic properties"> electronic properties</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties" title=" optical properties"> optical properties</a> </p> <a href="https://publications.waset.org/abstracts/92204/electronic-and-optical-properties-of-li2s-antifluorite-material" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/92204.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">290</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2521</span> Connected Objects with Optical Rectenna for Wireless Information Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chayma%20Bahar">Chayma Bahar</a>, <a href="https://publications.waset.org/abstracts/search?q=Chokri%20Baccouch"> Chokri Baccouch</a>, <a href="https://publications.waset.org/abstracts/search?q=Hedi%20Sakli"> Hedi Sakli</a>, <a href="https://publications.waset.org/abstracts/search?q=Nizar%20Sakli"> Nizar Sakli</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Harvesting and transport of optical and radiofrequency signals are a topical subject with multiple challenges. In this paper, we present a Optical RECTENNA system. We propose here a hybrid system solar cell antenna for 5G mobile communications networks. Thus, we propose rectifying circuit. A parametric study is done to follow the influence of load resistance and input power on Optical RECTENNA system performance. Thus, we propose a solar cell antenna structure in the frequency band of future 5G standard in 2.45 GHz bands. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antenna" title="antenna">antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=IoT" title=" IoT"> IoT</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20rectenna" title=" optical rectenna"> optical rectenna</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cell" title=" solar cell"> solar cell</a> </p> <a href="https://publications.waset.org/abstracts/129451/connected-objects-with-optical-rectenna-for-wireless-information-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/129451.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">178</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2520</span> Electronic and Optical Properties of YNi4Si-Type DyNi4Si Compound: A Full Potential Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dinesh%20Kumar%20Maurya">Dinesh Kumar Maurya</a>, <a href="https://publications.waset.org/abstracts/search?q=Sapan%20Mohan%20Saini"> Sapan Mohan Saini</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A theoretical formalism to calculate the structural, electronic and optical properties of orthorhombic crystals from first principle calculations is described. This is applied first time to new YNi4Si-type DyNi4Si compound. Calculations are performed using full-potential augmented plane wave (FPLAPW) method in the framework of density functional theory (DFT). The Coulomb corrected local-spin density approximation (LSDA+U) in the self-interaction correction (SIC) has been used for exchange-correlation potential. Our optimized results of lattice parameters show good agreement to the previously reported experimental study. Analysis of the calculated band structure of DyNi4Si compound demonstrates their metallic character. We found Ni-3d states mainly contribute to density of states from -5.0 eV to the Fermi level while the Dy-f states peak stands tall in comparison to the small contributions made by the Ni-d and R-d states above Fermi level, which is consistent with experiment, in DNi4Si compound. Our calculated optical conductivity compares well with the experimental data and the results are analyzed in the light of band-to-band transitions. We also report the frequency-dependent refractive index n(ω) and the extinction coefficient k(ω) of the compound. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=band%20structure" title="band structure">band structure</a>, <a href="https://publications.waset.org/abstracts/search?q=density%20of%20states" title=" density of states"> density of states</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties" title=" optical properties"> optical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=LSDA%2BU%20approximation" title=" LSDA+U approximation"> LSDA+U approximation</a>, <a href="https://publications.waset.org/abstracts/search?q=YNi4Si-%20type%20DyNi4Si%20compound" title=" YNi4Si- type DyNi4Si compound"> YNi4Si- type DyNi4Si compound</a> </p> <a href="https://publications.waset.org/abstracts/46155/electronic-and-optical-properties-of-yni4si-type-dyni4si-compound-a-full-potential-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46155.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">349</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2519</span> Structural and Optical Properties of RF-Sputtered ZnS and Zn(S,O) Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ould%20Mohamed%20Cheikh">Ould Mohamed Cheikh</a>, <a href="https://publications.waset.org/abstracts/search?q=Mounir%20Chaik"> Mounir Chaik</a>, <a href="https://publications.waset.org/abstracts/search?q=Hind%20El%20Aakib"> Hind El Aakib</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Aggour"> Mohamed Aggour</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelkader%20Outzourhit"> Abdelkader Outzourhit</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Zinc sulfide [ZnS] and oxygenated zinc sulfide Zn(O,S) thin films were deposited on glass substrates, by reactive cathodic radio-frequency (RF) sputtering. The substrates power and percentage of oxygen were varied in the range of 100W to 250W and from 5% to 20% respectively. The structural, morphological and optical properties of these thin films were investigated. The optical properties (mainly the refractive index, absorption coefficient and optical band gap) were examined by optical transmission measurements in the ultraviolet-visible-near Infrared wavelength range. XRD analysis indicated that all sputtered ZnS films were a single phase with a preferential orientation along the (111) plane of zinc blend (ZB). The crystallite size was in the range of 19.5 nm to 48.5 nm, the crystallite size varied with RF power reaching a maximum at 200 W. The Zn(O,S) films, on the other hand, were amorphous. UV-Visible, measurements showed that the ZnS film had more than 80% transmittance in the visible wavelength region while that of Zn(O,S is 85%. Moreover, it was observed that the band gap energy of the ZnS films increases slightly from 3.4 to 3.52 eV as the RF power was increased. The optical band gap of Zn(O,S), on the other hand, decreased from 4.2 to 3.89 eV as the oxygen partial pressure is increased in the sputtering atmosphere at a fixed RF-power. Scanning electron microscopy observations revealed smooth surfaces for both type of films. The X-ray reflectometry measurements on the ZnS films showed that the density of the films (3.9 g/cm3) is close that of bulk ZnS. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thin%20films%20Zn%28O" title="thin films Zn(O">thin films Zn(O</a>, <a href="https://publications.waset.org/abstracts/search?q=S%29%20properties" title="S) properties">S) properties</a>, <a href="https://publications.waset.org/abstracts/search?q=Zn%28O" title=" Zn(O"> Zn(O</a>, <a href="https://publications.waset.org/abstracts/search?q=S%29%20by%20Rf-sputtering" title="S) by Rf-sputtering">S) by Rf-sputtering</a>, <a href="https://publications.waset.org/abstracts/search?q=ZnS%20for%20solar%20cells" title=" ZnS for solar cells"> ZnS for solar cells</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20films%20for%20renewable%20energy" title=" thin films for renewable energy"> thin films for renewable energy</a> </p> <a href="https://publications.waset.org/abstracts/66128/structural-and-optical-properties-of-rf-sputtered-zns-and-znso-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66128.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">282</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2518</span> The Effect of the Deposition Parameters on the Microstructural and Optical Properties of Mn-Doped GeTe Chalcogenide Materials </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Adam%20Abdalla%20Elbashir%20Adam">Adam Abdalla Elbashir Adam</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiaomin%20Cheng"> Xiaomin Cheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiang%20Shui%20Miao"> Xiang Shui Miao </a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this work, the effect of the magnetron sputtering system parameters on the optical properties of the Mn doped GeTe were investigated. The optical properties of the Ge<sub>1-x</sub>Mn<sub>x</sub>Te thin films with different thicknesses are determined by analyzing the transmittance and reflectance data. The energy band gaps of the amorphous Mn-doped GeTe thin films with different thicknesses were calculated. The obtained results demonstrated that the energy band gap values of the amorphous films are quite different and they are dependent on the films thicknesses. The extinction coefficients of amorphous Mn-doped GeTe thin films as function of wavelength for different thicknesses were measured. The results showed that the extinction coefficients of all films are varying inversely with their optical transmission. Moreover, the results emphasis that, not only the microstructure, electrical and magnetic properties of Mn doped GeTe thin films vary with the films thicknesses but also the optical properties differ with the film thickness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=phase%20change%20magnetic%20materials" title="phase change magnetic materials">phase change magnetic materials</a>, <a href="https://publications.waset.org/abstracts/search?q=transmittance" title=" transmittance"> transmittance</a>, <a href="https://publications.waset.org/abstracts/search?q=absorbance" title=" absorbance"> absorbance</a>, <a href="https://publications.waset.org/abstracts/search?q=extinction%20coefficients" title=" extinction coefficients"> extinction coefficients</a> </p> <a href="https://publications.waset.org/abstracts/48213/the-effect-of-the-deposition-parameters-on-the-microstructural-and-optical-properties-of-mn-doped-gete-chalcogenide-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/48213.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">404</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2517</span> Optical and Magnetic Properties of Ferromagnetic Co-Ni Co-Doped TiO2 Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Bensaha">Rabah Bensaha</a>, <a href="https://publications.waset.org/abstracts/search?q=Badreddine%20Toubal"> Badreddine Toubal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the structural, optical and magnetic properties of TiO2, Co-doped TiO2, Ni-doped TiO2 and Co-Ni co-doped TiO2 thin films prepared by the sol-gel dip coating method. Fully anatase phase was obtained by adding metal ions without any detectable impurity phase or oxide formed. AFM and SEM micrographs clearly confirm that the addition of Co-Ni affects the shape of anatase nanoparticles. The crystallite sizes and surface roughness of TiO2 films increase with Co-doping, Ni-doping and Co–Ni co-doping, respectively. The refractive index, thickness and optical band gap values of the films were obtained by means of optical transmittance spectra measurements. The band gap of TiO2 sample was decreased by Co-doping, Ni-doping and Co–Ni co-doping TiO2 films. Both undoped and Co-Ni co-doped films were found to be ferromagnetic at room temperature may due to the presence of oxygen vacancy defect and the probable formation of metal clusters Co-Ni. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Co-Ni%20co-doped" title="Co-Ni co-doped">Co-Ni co-doped</a>, <a href="https://publications.waset.org/abstracts/search?q=anatase%20TiO2" title=" anatase TiO2"> anatase TiO2</a>, <a href="https://publications.waset.org/abstracts/search?q=ferromagnetic" title=" ferromagnetic"> ferromagnetic</a>, <a href="https://publications.waset.org/abstracts/search?q=sol-gel%20method" title=" sol-gel method"> sol-gel method</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20films" title=" thin films"> thin films</a> </p> <a href="https://publications.waset.org/abstracts/35968/optical-and-magnetic-properties-of-ferromagnetic-co-ni-co-doped-tio2-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35968.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">444</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2516</span> Structure and Optical Properties of Potassium Doped Zinc Oxide</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Lila%20A.%20Alkhattaby">Lila A. Alkhattaby</a>, <a href="https://publications.waset.org/abstracts/search?q=Norah%20A.%20Alsayegh"> Norah A. Alsayegh</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20S.%20Ansari"> Mohammad S. Ansari</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20O.%20Ansari"> Mohammad O. Ansari</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this work, we doped zinc oxide ZnO with potassium K we have synthesized using the sol-gel method. Structural properties were depicted by X-ray diffractometer (XRD) and energy distribution spectroscopy, X-ray diffraction studies confirm the nanosized of the particles and favored orientations along the (100), (002), (101), (102), (110), (103), (200), and (112) planes confirm the hexagonal wurtzite structure of ZnO NPs. The optical properties study using the UV-Vis spectroscopy. The band gap decreases from 4.05 eV to 3.88 eV, the lowest band gap at 10% doped concentration. The photoluminescence (PL) spectroscopy results show two main peaks, a sharp peak at ≈ 384 nm in the UV region and a broad peak around 479 nm in the visible region. The highest intensity of the band-edge luminescence was for 2% doped concentration because of the combined effect of the decreased probability of nonradiative recombination and has better crystallinity. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=K%20doped%20ZnO" title="K doped ZnO">K doped ZnO</a>, <a href="https://publications.waset.org/abstracts/search?q=photoluminescence%20spectroscopy" title=" photoluminescence spectroscopy"> photoluminescence spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=UV-Vis%20spectroscopy" title=" UV-Vis spectroscopy"> UV-Vis spectroscopy</a>, <a href="https://publications.waset.org/abstracts/search?q=x-ray%20spectroscopy" title=" x-ray spectroscopy"> x-ray spectroscopy</a> </p> <a href="https://publications.waset.org/abstracts/142665/structure-and-optical-properties-of-potassium-doped-zinc-oxide" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/142665.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">240</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2515</span> An Optimal Matching Design Method of Space-Based Optical Payload for Typical Aerial Target Detection</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yin%20Zhang">Yin Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Kai%20Qiao"> Kai Qiao</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiyang%20Zhi"> Xiyang Zhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Jinnan%20Gong"> Jinnan Gong</a>, <a href="https://publications.waset.org/abstracts/search?q=Jianming%20Hu"> Jianming Hu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to effectively detect aerial targets over long distances, an optimal matching design method of space-based optical payload is proposed. Firstly, main factors affecting optical detectability of small targets under complex environment are analyzed based on the full link of a detection system, including band center, band width and spatial resolution. Then a performance characterization model representing the relationship between image signal-to-noise ratio (SCR) and the above influencing factors is established to describe a detection system. Finally, an optimal matching design example is demonstrated for a typical aerial target by simulating and analyzing its SCR under different scene clutter coupling with multi-scale characteristics, and the optimized detection band and spatial resolution are presented. The method can provide theoretical basis and scientific guidance for space-based detection system design, payload specification demonstration and information processing algorithm optimization. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=space-based%20detection" title="space-based detection">space-based detection</a>, <a href="https://publications.waset.org/abstracts/search?q=aerial%20targets" title=" aerial targets"> aerial targets</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20system%20design" title=" optical system design"> optical system design</a>, <a href="https://publications.waset.org/abstracts/search?q=detectability%20characterization" title=" detectability characterization"> detectability characterization</a> </p> <a href="https://publications.waset.org/abstracts/107378/an-optimal-matching-design-method-of-space-based-optical-payload-for-typical-aerial-target-detection" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/107378.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">168</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2514</span> Structural and Optical Characterization of Rice-Husk-Derived SiO₂ Crystals-reinforced PVA Composites</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Suminar%20Pratapa">Suminar Pratapa</a>, <a href="https://publications.waset.org/abstracts/search?q=Agus%20Riyanto"> Agus Riyanto</a>, <a href="https://publications.waset.org/abstracts/search?q=Silmi%20Machmudah"> Silmi Machmudah</a>, <a href="https://publications.waset.org/abstracts/search?q=Sri%20Yani%20Purwaningsih"> Sri Yani Purwaningsih</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this study was to investigate the optical properties of polyvinyl alcohol (PVA) and its prospective applications by adding crystalline silica which is usually used as a reinforcing agent. To do this, we synthesized and evaluated PVA-based composites reinforced with silica crystals, namely cristobalite, derived from rice husk. The experimental procedure involved the production of SiO2 particles using rice husk precursors, which were subsequently subjected to calcination at a rate of 10 °C/min for a duration of 3 hours. This process primarily resulted in the formation of SiO2 crystals in the cristobalite phase, according to X-ray diffraction (XRD). Following this, the crystals were incorporated into polyvinyl alcohol (PVA) via a casting technique, resulting in the formation of composite sheets. The SiO2 contents in the composites were 0, 2.5, 5.0, and 10.%. XRD and Fourier-transform infrared spectroscopy (FTIR) techniques provided confirmation of the composites' successful synthesis, i.e., it did not yield any indications of chemical bonding between polyvinyl alcohol (PVA) and silicon dioxide (SiO2), indicating that the interaction was limited to interfacial reactions. The incorporation of SiO2 crystals resulted in a notable enhancement in UV-vis light absorption and a decrease in the optical band gap. Addition of 2.5, 5.0, and 10.% SiO2, for example, decreases the direct optical band gap of the composites form 5.37, 5.19, and 5.02 eV respectively, while the indirect band gaps of the samples were 4.44, 4.84, and 4.48 eV, correspondingly. These findings emphasize the efficacy of rice husk-derived SiO2 crystals as both reinforcement agents and modifiers of optical properties in the polymer composites, showcasing their significant potential to modify the composite's structural and optical characteristics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=rice%20husk" title="rice husk">rice husk</a>, <a href="https://publications.waset.org/abstracts/search?q=cristaline%20SiO%E2%82%82" title=" cristaline SiO₂"> cristaline SiO₂</a>, <a href="https://publications.waset.org/abstracts/search?q=PVA-based%20composites" title=" PVA-based composites"> PVA-based composites</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20characteristics" title=" structural characteristics"> structural characteristics</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20properties." title=" optical properties."> optical properties.</a> </p> <a href="https://publications.waset.org/abstracts/185287/structural-and-optical-characterization-of-rice-husk-derived-sio2-crystals-reinforced-pva-composites" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/185287.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">46</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2513</span> Structural and Optoelectronic Properties of Monovalent Cation Doping PbS Thin Films </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Melissa%20Chavez%20Portillo">Melissa Chavez Portillo</a>, <a href="https://publications.waset.org/abstracts/search?q=Hector%20Juarez%20Santiesteban"> Hector Juarez Santiesteban</a>, <a href="https://publications.waset.org/abstracts/search?q=Mauricio%20Pacio%20Castillo"> Mauricio Pacio Castillo</a>, <a href="https://publications.waset.org/abstracts/search?q=Oscar%20Portillo%20Moreno"> Oscar Portillo Moreno</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nanocrystalline Li-doped PbS thin films have been deposited by chemical bath deposition technique. The goal of this work is to study the modification of the optoelectronic and structural properties of Lithium incorporation. The increase of Li doping in PbS thin films leads to an increase of band gap in the range of 1.4-2.3, consequently, quantum size effect becomes pronounced in the Li-doped PbS films, which lead to a significant enhancement in the optical band gap. Doping shows influence in the film growth and results in a reduction of crystallite size from 30 to 14 nm. The refractive index was calculated and a relationship with dielectric constant was investigated. The dc conductivities of Li-doped and undoped samples were measured in the temperature range 290-340K, the conductivity increase with increase of Lithium content in the PbS films. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=doping" title="doping">doping</a>, <a href="https://publications.waset.org/abstracts/search?q=quantum%20confinement" title=" quantum confinement"> quantum confinement</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20band%20gap" title=" optical band gap"> optical band gap</a>, <a href="https://publications.waset.org/abstracts/search?q=PbS" title=" PbS"> PbS</a> </p> <a href="https://publications.waset.org/abstracts/58519/structural-and-optoelectronic-properties-of-monovalent-cation-doping-pbs-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/58519.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">383</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2512</span> A Spectroscopic Study by Photoluminescence of Erbium in Gallium Nitride</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Melouah">A. Melouah</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Diaf"> M. Diaf</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The III-N nitride semiconductors appear to be excellent host materials, in particular, GaN epilayers doped with Erbium ions have shown a highly reduced thermal quenching of the Er luminescence intensity from cryogenic to elevated temperatures. The remarkable stability may be due to the large energy band gap of the material. Two methods are used for doping the Gallium nitride films with Erbium ions; ion implantation in the wafers obtained by (CVDOM) and in-situ incorporation during epitaxial growth of the layers by (MBE). Photoluminescence (PL) spectroscopy has been the main optical technique used to characterize the emission of Er-doped III-N semiconductor materials. This technique involves optical excitation of Er3+ ions and measurement of the spectrum of the light emission as a function of energy (wavelength). Excitation at above band gap energy leads to the creation of Electron-Hole pairs. Some of this pairs may transfer their energy to the Er3+ ions, exciting the 4f-electrons and resulting in optical emission. This corresponds to an indirect excitation of the Er3+ ions by electron-hole pairs. The direct excitation by the optical pumping of the radiation can be obtained. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=photoluminescence" title="photoluminescence">photoluminescence</a>, <a href="https://publications.waset.org/abstracts/search?q=Erbium" title=" Erbium"> Erbium</a>, <a href="https://publications.waset.org/abstracts/search?q=GaN" title=" GaN"> GaN</a>, <a href="https://publications.waset.org/abstracts/search?q=semiconductor%20%20materials" title=" semiconductor materials"> semiconductor materials</a> </p> <a href="https://publications.waset.org/abstracts/46060/a-spectroscopic-study-by-photoluminescence-of-erbium-in-gallium-nitride" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46060.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">414</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2511</span> Synthesis and Study of Properties of Polyaniline/Nickel Sulphide Nanocomposites</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Okpaneje%20Onyinye%20Theresa">Okpaneje Onyinye Theresa</a>, <a href="https://publications.waset.org/abstracts/search?q=Ugwu%20Laeticia%20Udodiri"> Ugwu Laeticia Udodiri</a>, <a href="https://publications.waset.org/abstracts/search?q=Okereke%20Ngozi%20Agatha"> Okereke Ngozi Agatha</a>, <a href="https://publications.waset.org/abstracts/search?q=Okoli%20Nonso%20Livinus"> Okoli Nonso Livinus</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work is on the synthesis and study of the optical characterization of polyaniline/nickel sulphide nanocomposite. Polyaniline (PANI) and nickel sulphide (NiS) nanoparticles were synthesized by oxidative chemical polymerization and sol-gel method. The polyaniline nickel sulphide nanocomposites with various concentrations of NiS were synthesized by in-situ polymerization of aniline monomer. In each case, the nickel sulphide nanoparticles were uniformly dispersed in the aniline hydrochloride before the initiation of oxidative chemical polymerization using ammonium persulphate. The samples formed were subjected to optical characterization using an ultraviolet (UV)-visible light (VIS) spectrophotometer (model: 756S UV – VIS). Optical analysis of the synthesized nanoparticles and nanocomposites showed absorption of radiation within VIS regions. The Tauc model was used to obtain the optical band gap. Energy band gap values of PANI and NiS were found to be 2.50 eV and 1.95 eV, respectively. PANI/NiSnanocomposites has an energy band gap that decreased from 2.25 eV to 1.90 eV as the amount of NiS increased (from 0.5g to 2.0g). These optical results showed that these nanocomposites are potential materials to be considered in solar cells and optoelectronics devices. The structural analysis confirmed the formation of polyaniline and hexagonal nickel sulphide with an average crystallite size of 25.521 nm, while average crystallite sizes of PANI/NiSnanocomposites ranged from 19.458 nm to 25.108 nm. Average particle sizes obtained from the SEM images ranged from 23.24 nm to 51.88 nm. Compositional results confirmed the presence of desired elements that made up the nanoparticles and nanocomposites. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=polyaniline" title="polyaniline">polyaniline</a>, <a href="https://publications.waset.org/abstracts/search?q=nickel%20sulphide" title=" nickel sulphide"> nickel sulphide</a>, <a href="https://publications.waset.org/abstracts/search?q=polyaniline-nickel%20sulphide%20nanocomposite" title=" polyaniline-nickel sulphide nanocomposite"> polyaniline-nickel sulphide nanocomposite</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20characterization" title=" optical characterization"> optical characterization</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20analysis" title=" structural analysis"> structural analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=morphological%20properties" title=" morphological properties"> morphological properties</a>, <a href="https://publications.waset.org/abstracts/search?q=compositional%20properties" title=" compositional properties"> compositional properties</a> </p> <a href="https://publications.waset.org/abstracts/153743/synthesis-and-study-of-properties-of-polyanilinenickel-sulphide-nanocomposites" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/153743.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">114</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=optical%20band%20gap&page=2">2</a></li> <li class="page-item"><a class="page-link" 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