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Topology optimization of freeform large-area metasurfaces

Author(s)
Lin, Zin; Liu, Victor; Pestourie, Raphael; Johnson, Steven G
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We demonstrate optimization of optical metasurfaces over 10⁵–10⁶ degrees of freedom in two and three dimensions, 100–1000+ wavelengths (λ) in diameter, with 100+ parameters per λ². In particular, we show how topology optimization, with one degree of freedom per high-resolution “pixel,” can be extended to large areas with the help of a locally periodic approximation that was previously only used for a few parameters per λ². In this way, we can computationally discover completely unexpected metasurface designs for challenging multi-frequency, multi-angle problems, including designs for fully coupled multi-layer structures with arbitrary per-layer patterns. Unlike typical metasurface designs based on subwavelength unit cells, our approach can discover both sub- and supra-wavelength patterns and can obtain both the near and far fields.
Date issued
2019-05
URI
https://hdl.handle.net/1721.1/123826
Department
Massachusetts Institute of Technology. Department of Mathematics
Journal
Optics Express
Publisher
The Optical Society
Citation
Lin, Zin et al. "Topology optimization of freeform large-area metasurfaces." Optics Express 27, 11 (May 2019): 15765-15775 © 2019 Optical Society of America
Version: Final published version
ISSN
1094-4087

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