Inverse design of large-area metasurfaces

Raphaël Pestourie*, Carlos Pérez-Arancibia, Zin Lin, Wonseok Shin, Federico Capasso, Steven G. Johnson

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

180 Citations (Scopus)
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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).
Original languageEnglish
Pages (from-to)33732-33747
Number of pages16
JournalOptics express
Volume26
Issue number26
DOIs
Publication statusPublished - 12 Dec 2018
Externally publishedYes

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