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Proceedings Paper

Controlling nanoscale optical transmission with dielectric metasurfaces at visible wavelengths
Author(s): Tapashree Roy; Haogang Cai; Subrata Mitra; David Czaplewski; Daniel Lopez
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Paper 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.

Paper Details

Date Published: 20 February 2017
PDF: 6 pages
Proc. SPIE 10113, High Contrast Metastructures VI, 101130X (20 February 2017); doi: 10.1117/12.2256030
Show Author Affiliations
Tapashree Roy, Argonne National Lab. (United States)
Haogang Cai, Argonne National Lab. (United States)
Subrata Mitra, Argonne National Lab. (United States)
David Czaplewski, Argonne National Lab. (United States)
Daniel Lopez, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 10113:
High Contrast Metastructures VI
Connie J. Chang-Hasnain; Andrei Faraon; Fumio Koyama; Weimin Zhou, Editor(s)

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