Bilayer metasurface for directional launching of cross-polarization component

Joonsoo Kim; Yohan Lee; Hansik Yun; Hyeonsoo Park; Byoungho Lee

doi:10.1117/12.2247798

31 October 2016 Bilayer metasurface for directional launching of cross-polarization component

Joonsoo Kim, Yohan Lee, Hansik Yun, Hyeonsoo Park, Byoungho Lee

Proceedings Volume 10022, Holography, Diffractive Optics, and Applications VII; 100222E (2016) https://doi.org/10.1117/12.2247798
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

In this paper, we propose a bilayer metasurface which is capable of launching helicity-inverted wave only in the forward direction. In order to obtain directional scattering characteristics of individual cells, we employed two layers of thin metasurfaces that are separated by a dielectric spacer. Multiple scattering analysis is used to derive design conditions for single metasurface reflectances for each polarization and it was shown that such target reflectances are realizable with split-ring aperture. The unit cell structure optimized for forward-only scattering of cross-polarization component is shown to have power extinction ratio as high as 32. The proposed structure can potentially form a supercell with reflective cells so that geometric phases of transmitted light and reflected light can be independently controlled. The proposed scheme is expected to pave a way to new types of metasurfaces with multiplexed optical functions.

Citation Download Citation

Joonsoo Kim, Yohan Lee, Hansik Yun, Hyeonsoo Park, and Byoungho Lee "Bilayer metasurface for directional launching of cross-polarization component", Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100222E (31 October 2016); https://doi.org/10.1117/12.2247798

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