期刊
OPTICS LETTERS
卷 43, 期 2, 页码 267-270出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.43.000267
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资金
- National Key R&D Program of China [2017YFA0303800, 2017YFA0305100]
- National Natural Science Foundation of China (NSFC) [61775106, 11711530205, 11374006, 11774185, 91750204]
- 111 Project [B07013]
- PCSIRT [IRT_13R29]
- Fundamental Research Funds for the Central Universities
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. (c) 2018 Optical Society of America
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