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arXiv · 1906.05376

Overlapping domains for topology optimization of large-area metasurfaces

Zin Lin·Steven G. Johnson
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Abstract

We introduce an overlapping-domain approach to large-area metasurface design, in which each simulated domain consists of a unit cell and overlapping regions from the neighboring cells plus PML absorbers. We show that our approach generates greatly improved metalens quality compared to designs produced using a locally periodic approximation, thanks to $\sim 10\times$ better accuracy with similar computational cost. We use the new approach with topology optimization to design large-area ($200\lambda$) high-NA (0.71) multichrome and broadband achromatic lenses with high focusing efficiency ($\sim 50\%$), greatly improving upon previously reported works.

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Zin Lin, Steven G. Johnson. 2019-06-12. Overlapping domains for topology optimization of large-area metasurfaces. https://doi.org/10.1364/oe.27.032445

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