Tungsten Disulfide-Gold Nanohole Hybrid Metasurfaces for Nonlinear Metalenses in the Visible Region
Tungsten Disulfide-Gold Nanohole Hybrid Metasurfaces for Nonlinear Metalenses in the Visible Region
复制标题
用于可见光区域非线性超透镜的二硫化钨-金纳米孔混合超表面
DOI：
10.1021/acs.nanolett.7b05033
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发表时间：
2018-02-01
期刊：
影响因子：
10.8
通讯作者：
Lu, Peixiang
中科院分区：
文献类型：
--
作者：
Chen, Jiawei;Wang, Kai;Lu, Peixiang
近年来，非线性混合超颖表面成为纳米光子学和纳米技术研究中一个引人注目的新概念。它由具有固有的大非线性极化率的半导体和传统的等离子体元表面组成，为有效地产生和操纵非线性光学响应提供了机会。基于多量子阱的等离子体超颖表面在中红外波段具有很高的二次谐波转换效率。然而，它还没有在可见区域得到证明。在这里，我们提出了一种新型的非线性混合超颖表面的可见光区，它由一个单一的二硫化钨（WS 2）层和相控金纳米孔阵列。结果表明，在810 nm处，该超表面的二次谐波极化率高达10（-1）nm/V，比典型的等离子体超表面的二次谐波极化率高2-3个数量级。非线性超透镜的焦距为30，50，和100 μ m的实验证明，提供了一个直接的证据，产生和操纵SH信号的基础上的非线性混合超表面。它在设计集成化、小型化、紧凑化和高效的非线性光学器件，如频率转换器、非线性全息术和非线性光学涡旋光束的产生等方面有着巨大的应用潜力。
Recently, nonlinear hybrid metasurface comes into an attractive new concept in the research of nanophotonics and nanotechnology. It is composed of semiconductors with an intrinsically large nonlinear susceptibility and traditional plasmonic metasurfaces, offering opportunities for efficiently generating and manipulating nonlinear optical responses. A high second-harmonic generation (SHG) conversion efficiency has been demonstrated in the mid-infrared region by using multiquantum-well (MQW)-based plasmonic metasurfaces. However, it has yet to be demonstrated in the visible region. Here, we present a new type of nonlinear hybrid metasurfaces for the visible region, which consists of a single layer of tungsten disulfide (WS2) and a phased gold nanohole array. The results indicate that a large SHG susceptibility of similar to 10(-1) nm/V at 810 nm is achieved, which is 2-3 orders of magnitude larger than that of typical plasmonic metasurfaces. Nonlinear metalenses with the focal lengths of 30, 50, and 100 mu m are demonstrated experimentally, providing a direct evidence for both generating and manipulating SH signals based on the nonlinear hybrid metasurfaces. It shows great potential applications in designing of integrated, ultrathin, compacted, and efficient nonlinear optical devices, such as frequency converters, nonlinear holography, and the generation of nonlinear optical vortex beams.