Inverse design of large-area metasurfaces
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arXiv_paper1_latest.pdf
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Author(s)
Capasso, Federico
Pestourie, Raphael
Perez Arancibia, Carlos Andres
Lin, Zin
Shin, Wonseok
Johnson, Steven G
Date Issued
December 2018
Journal
Optics Express
Publisher
Optical Society of America
Citation
Pestourie, Raphaël et al. “Inverse Design of Large-Area Metasurfaces.” Optics Express 26, 26 (December 2018): 33732 © 2018 Optical Society of America
Version
Author's final manuscript
Abstract
We present a computational framework for efficient optimization-based “inverse design” of large-area “metasurfaces” (subwavelength-patterned surfaces) for applications such as multi-wavelength/multi-angle optimizations, and demultiplexers. To optimize surfaces that can be thousands of wavelengths in diameter, with thousands (or millions) of parameters, the key is a fast approximate solver for the scattered field. We employ a “locally periodic” approximation in which the scattering problem is approximated by a composition of periodic scattering problems from each unit cell of the surface, and validate it against brute-force Maxwell solutions. This is an extension of ideas in previous metasurface designs, but with greatly increased flexibility, e.g. to automatically balance tradeoffs between multiple frequencies or to optimize a photonic device given only partial information about the desired field. Our approach even extends beyond the metasurface regime to non-subwavelength structures where additional diffracted orders must be included (but the period is not large enough to apply scalar diffraction theory).
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1364/OE.26.033732
