Topology optimization of freeform large-area metasurfaces
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oe-27-11-15765.pdf
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2.66 MB
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Checksum (MD5)
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Author(s)
Lin, Zin
Liu, Victor
Pestourie, Raphael
Johnson, Steven G
Date Issued
May 2019
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
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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DOI of Published Version
https://doi.org/10.1364/oe.27.015765
