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9 March 2021 Accounting for substrate-particle interactions in metasurfaces using fast discrete dipole approximation simulations
Weilin Liu, Euan McLeod
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Proceedings Volume 11695, High Contrast Metastructures X; 116950X (2021) https://doi.org/10.1117/12.2579081
Event: SPIE OPTO, 2021, Online Only
Abstract
Metasurfaces are planar nanostructured optical elements for lensing, wave-front shaping, and polarization control. A general but time-consuming metasurface design tool is the finite difference time domain (FDTD) technique. The discrete dipole approximation (DDA) is a rigorous and fast alternative for computing the electromagnetic field scattered by particles, but has not been widely used in metasurface design because of the complicated numerical difficulties imposed by the nanostructure-substrate interaction. Here we present a substrate-compatible DDA formulation using a 1D Green’s function method under cylindrical coordinates, proving that DDA can be a promising alternative method to design and optimize nanophotonic devices.
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Weilin Liu and Euan McLeod "Accounting for substrate-particle interactions in metasurfaces using fast discrete dipole approximation simulations", Proc. SPIE 11695, High Contrast Metastructures X, 116950X (9 March 2021); https://doi.org/10.1117/12.2579081
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KEYWORDS
Finite-difference time-domain method
Gold
Nanostructures
Beam shaping
Computer simulations
Lenses
Modulation
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