20 February 2017 Controlling nanoscale optical transmission with dielectric metasurfaces at visible wavelengths
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Proceedings Volume 10113, High Contrast Metastructures VI; 101130X (2017) https://doi.org/10.1117/12.2256030
Event: SPIE OPTO, 2017, San Francisco, California, United States
Abstract
Recently, metasurfaces and metalenses have become an important subject in the domain of novel optical devices. Numerous nanostructures, with different fundamental principles, materials, and topologies, have been proposed, but general design rules for optimization of their efficiency are not well established yet. Particularly attractive are metasurfaces consisting of Huygens resonators since they offer precise control of the intensity and phase of the transmitted light. In this paper, we demonstrate a Huygens metasurface capable of focusing visible light. We study the impact of the layout of the lens on their efficiency by comparing two metalenses designs: concentric annular regions of equal width and constant phase, with concentric rings defined by individual nano-resonators. The latter provides a better approximation to the ideal phase profile and as a consequence, a high-efficiency lens. Metalenses with both designs were fabricated by e-beam lithography and characterized with a custom-built setup. Experimental results demonstrate that the design with fine discretization improves the lens efficiency by a factor of 2.6.
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Tapashree Roy, Tapashree Roy, Haogang Cai, Haogang Cai, Subrata Mitra, Subrata Mitra, David Czaplewski, David Czaplewski, Daniel Lopez, Daniel Lopez, } "Controlling nanoscale optical transmission with dielectric metasurfaces at visible wavelengths", Proc. SPIE 10113, High Contrast Metastructures VI, 101130X (20 February 2017); doi: 10.1117/12.2256030; https://doi.org/10.1117/12.2256030
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