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- W2743896456 abstract "Topology optimization is a powerful iterative inverse design technique in metasurface engineering and can transform an initial layout into a high-performance device. With this method, devices are optimized within a local design phase space, making the identification of suitable initial geometries essential. In this Letter, we examine the impact of initial geometric layout on the performance of large-angle (75 deg) topology-optimized metagrating deflectors. We find that when conventional metasurface designs based on dielectric nanoposts are used as initial layouts for topology optimization, the final devices have efficiencies around 65%. In contrast, when random initial layouts are used, the final devices have ultra-high efficiencies that can reach 94%. Our numerical experiments suggest that device topologies based on conventional metasurface designs may not be suitable to produce ultra-high-efficiency, large-angle metasurfaces. Rather, initial geometric layouts with non-trivial topologies and shapes are required." @default.
- W2743896456 created "2017-08-17" @default.
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- W2743896456 date "2017-08-09" @default.
- W2743896456 modified "2023-10-17" @default.
- W2743896456 title "Topology-optimized metasurfaces: impact of initial geometric layout" @default.
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- W2743896456 doi "https://doi.org/10.1364/ol.42.003161" @default.
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