Nano-Kirigami Metasurface with Giant Nonlinear Optical Circular Dichroism
Nano-Kirigami Metasurface with Giant Nonlinear Optical Circular Dichroism
复制标题
具有巨型非线性光学圆的纳米剪纸超表面
DOI：
10.1002/lpor.202000085
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发表时间：
2020
影响因子：
11
通讯作者：
Li Guixin
中科院分区：
文献类型：
--
作者：
Tang Yutao;Liu Zhiguang;Deng Junhong;Li Kingfai;Li Jiafang;Li Guixin
在线性光学体系中，研究表明，使用光学超表面可以轻松控制光的偏振、振幅和相位，从而实现超透镜、高效全息图等的强大设计。相比之下，超表面上非线性光学过程的操纵更具挑战性。这主要是因为超表面非线性源也在调制从其发射的波。因此，设计具有多种光学功能的非线性元原子是非常可取的。在此，实验证明了纳米剪纸等离子体超表面产生二次谐波的宽带和近乎统一的非线性光学圆二色性（CD），该超表面是独立的，总厚度约为激发波长的三分之一。宽带和接近统一的非线性CD归因于基本波长的强CD和来自具有三重旋转对称性的纳米剪纸元原子的自旋控制的二次谐波产生。所提出的非线性纳米剪纸超表面为在纳米尺度上实现各种非线性光学功能提供了一个新颖的平台。
In linear optical regime, it is shown that the polarization, amplitude, and phase of light can be easily controlled by using optical metasurfaces, thus enabling the powerful designs of metalenses, high‐efficiency holograms, and so on. In comparison, the manipulation of nonlinear optical processes on the metasurfaces is much more challenging. This is mainly because the metasurface nonlinear source is also modulating the waves emitted from it. Thus, designing nonlinear meta‐atoms with multiple optical functionalities is highly desirable. Herein, the broadband and near‐unity nonlinear optical circular dichroism (CD) of second harmonic generation from a nano‐kirigami plasmonic metasurface is experimentally demonstrated, which is free‐standing with total thickness of about one‐third of the excitation wavelength. The broadband and near unity nonlinear CD is attributed to both the strong CD of fundamental wavelengths and spin‐controlled second harmonic generations from the nano‐kirigami meta‐atoms with threefold rotational symmetries. The proposed nonlinear nano‐kirigami metasurface provides a novel platform for realizing various nonlinear optical functionalities at the nanoscale.