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20 August 2020 Rigorous and fast computation of plasmonic particle-substrate interactions
Weilin Liu, Euan McLeod
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Proceedings Volume 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII; 114620Z (2020) https://doi.org/10.1117/12.2569009
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
As powerful wave-front shapers, meta-surfaces can be used as planar lenses, polarizers, vortex generators, and other components. A general design approach is the finite difference time domain (FDTD) technique, which is robust but computationally costly. The discrete dipole approximation (DDA) is a rigorous and fast alternative, but has not been widely used in nanophotonic design because of computational complexity resulting from dipole-substrate interactions. Here we present a substrate-compatible DDA formulation using a one-dimensional Green’s function in cylindrical coordinates that accurately handles singularities and high-frequency oscillations. It is significantly faster with similar accuracy compared to several other methods, including FDTD.
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Weilin Liu and Euan McLeod "Rigorous and fast computation of plasmonic particle-substrate interactions", Proc. SPIE 11462, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVIII, 114620Z (20 August 2020); https://doi.org/10.1117/12.2569009
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KEYWORDS
Finite-difference time-domain method
Nanostructures
Plasmonics
Nanophotonics
Beam shaping
Dielectrics
Geometrical optics
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