Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation
Nonlinear Metasurface for Simultaneous Control of Spin and Orbital Angular Momentum in Second Harmonic Generation
复制标题
用于同时控制二次谐波产生中自旋和轨道角动量的非线性超表面
DOI：
10.1021/acs.nanolett.7b04451
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发表时间：
2017-12-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Shuang
中科院分区：
文献类型：
--
作者：
Li, Guixin;Wu, Lin;Zhang, Shuang
光的自旋和轨道角动量（SAM和OAM）为高容量和鲁棒的光通信提供了新的途径。虽然角动量光的产生在线性光学中得到了很好的研究，但其进一步集成到非线性光学器件中将为通过新频率的额外信息通道增加光通信容量开辟新的途径。然而，它一直具有挑战性的操纵SAM和OAM的非线性信号在谐波产生过程中与传统的非线性材料。在这里，我们报告的产生自旋控制的OAM的光的谐波产生通过使用光子超颖表面。利用具有三重旋转对称性的金亚原子的二次谐波产生（SHG），实验验证了OAM模式的自旋操控。通过在超表面器件中引入非线性相位奇异性，我们成功地利用片上超表面干涉仪产生并测量了自旋控制OAM模式的二次谐波拓扑电荷。在这项工作中提出的非线性光子超颖表面不仅开辟了新的途径操纵的OAM的非线性光学信号，但也有利于理解的非线性自旋轨道相互作用的光在纳米器件。
The spin and orbital angular momentum (SAM and OAM) of light is providing a new gateway toward high capacity and robust optical communications. While the generation of light with angular momentum is well studied in linear optics, its further integration into nonlinear optical devices will open new avenues for increasing the capacity of optical communications through additional information channels at new frequencies. However, it has been challenging to manipulate the both SAM and OAM of nonlinear signals in harmonic generation processes with conventional nonlinear materials. Here, we report the generation of spin-controlled OAM of light in harmonic generations by using ultrathin photonic metasurfaces. The spin manipulation of OAM mode of harmonic waves is experimentally verified by using second harmonic generation (SHG) from gold meta-atom with 3-fold rotational symmetry. By introducing nonlinear phase singularity into the metasurface devices, we successfully generate and measure the topological charges of spin-controlled OAM mode of SHG through an on-chip metasurface interferometer. The nonlinear photonic metasurface proposed in this work not only opens new avenues for manipulating the OAM of nonlinear optical signals but also benefits the understanding of the nonlinear spin orbit interaction of light in nanoscale devices.