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Reference Module in Chemistry, Molecular Sciences and Chemical Engineering || Application of Luminescence Spectroscopy in New Materials for Solar Energy Utilization
摘要： The most important problems of our age are the search of new energy sources and the ways to decrease the pollution from organic fuels. Solar energy could provide a partial solution to the problem. If luminescent solar concentrators (LSCs) will be applied to the existing and modern buildings a part of the problem could be solved. In the following I describe the principle of LSCs and the ways by which their efficiency can be achieved.
关键词： Luminescence Spectroscopy,Solar Energy,Lanthanides,New Materials,Luminescent Solar Concentrators,Surface Plasmons
更新于2025-09-09 09:28:46
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Nonlinear emission from silver-coated 3D hollow nanopillars
摘要： High aspect ratio metal nanostructures have been the subject of a number of studies in the past, due to their pronounced resonances in the infrared that can be exploited to enhance vibrational spectroscopies. In this work, we investigate the nonlinear optical response of both individual and closely-packed assemblies of vertical hollow Ag nanopillars upon excitation with ultrafast laser pulses. In particular, the analysis of their nonlinear emission spectra evidences an intense two photon photoluminescence (TPPL) emission and a neat signature of second harmonic generation (SHG). Given the relatively low background, this pronounced nonlinear emission could be employed as a local probe for analytes trapped at the surface of the nanopillar or flowing through it. For this reason, these nanostructures may become appealing building blocks in multi-purpose devices for nonlinear photonics and sensing.
关键词： Two Photon Photoluminescence,Ag Nanopillars,Localized Surface Plasmons,3D nanofabrications,Second Harmonic Generation
更新于2025-09-09 09:28:46
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Semi-implicit FDTD TW scheme for modelling effective surface plasmons
摘要： A semi-implicit finite-difference time-domain thin-wire (TW) scheme with a relaxed stability condition is proposed for modelling effective surface plasmons in waveguide metamaterials. Its formulation is based on introducing the Newmark-Beta method into the TW formulation based on the contour-path integral of Maxwell’s equations around a wire. The resultant scheme is magnetically implicit. Its stability, accuracy and efficiency are assessed in the application to a wire-added parallel-plate waveguide perturbed with a small gap.
关键词： Newmark-Beta method,surface plasmons,semi-implicit FDTD,thin-wire scheme,waveguide metamaterials
更新于2025-09-04 15:30:14