TY - GEN
T1 - Controlling nanoscale optical transmission with dielectric metasurfaces at visible wavelengths
AU - Roy, Tapashree
AU - Cai, Haogang
AU - Mitra, Subrata
AU - Czaplewski, David
AU - Lopez, Daniel
N1 - Publisher Copyright:
© 2017 SPIE.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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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U2 - 10.1117/12.2256030
DO - 10.1117/12.2256030
M3 - Conference contribution
AN - SCOPUS:85019166724
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - High Contrast Metastructures VI
A2 - Zhou, Weimin
A2 - Koyama, Fumio
A2 - Faraon, Andrei
A2 - Chang-Hasnain, Connie J.
PB - SPIE
T2 - High Contrast Metastructures VI
Y2 - 31 January 2017 through 2 February 2017
ER -