Nanoscale beam splitters based on gradient metasurfaces

Beam splitters are essential components in various optical and photonic applications, for example, interferometers, multiplexers, and so on. Present beam splitters based on cubes or plates are normally bulky. Realizing beam splitters in nanoscales is useful to reduce the total size of photonic devic...

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Published in:Optics letters 2018-01, Vol.43 (2), p.267-270
Main Authors: Zhang, Di, Ren, Mengxin, Wu, Wei, Gao, Ninghui, Yu, Xuanyi, Cai, Wei, Zhang, Xinzheng, Xu, Jingjun
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cited_by cdi_FETCH-LOGICAL-c334t-e09a20586a668dabd9a4253a432075f5c24dc20c905691961292a1db46a1bfef3
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container_issue 2
container_start_page 267
container_title Optics letters
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creator Zhang, Di
Ren, Mengxin
Wu, Wei
Gao, Ninghui
Yu, Xuanyi
Cai, Wei
Zhang, Xinzheng
Xu, Jingjun
description Beam splitters are essential components in various optical and photonic applications, for example, interferometers, multiplexers, and so on. Present beam splitters based on cubes or plates are normally bulky. Realizing beam splitters in nanoscales is useful to reduce the total size of photonic devices. We demonstrate here a beam splitter with nanoscale thickness based on a gradient metasurface comprising lithium niobate cylinder arrays. Since one unit cell of metasurface comprising two cylinder rows shows two opposite phase gradients, the incident light is split into different directions according to the generalized Snell's law. The split ratio is proven to be effectively tunable.
doi_str_mv 10.1364/OL.43.000267
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title Nanoscale beam splitters based on gradient metasurfaces
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