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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Bibliographic Details
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
Format: Article
Language:English
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.000267