Mao Ningbin, Deng Junhong, Zhang Xuecai, Tang Yutao, Jin Mingke, Li Yang, Liu Xuan, Li Kingfai, Cao Tun, Cheah Kokwai, Wang Hong, Ng Jack, Li Guixin
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Hong Kong, China.
Nano Lett. 2020 Oct 14;20(10):7463-7468. doi: 10.1021/acs.nanolett.0c02910. Epub 2020 Sep 14.
In linear optics, the metasurface represents an ideal platform for encoding optical information because of its unprecedented abilities of manipulating the intensity, polarization, and phase of light wave with subwavelength meta-atoms. However, controlling various degrees of freedom of light in nonlinear optics remains elusive. Here, we propose a nonlinear plasmonic metasurface working in the near-infrared regime that can simultaneously encode optical images in the real and Fourier spaces. This is achieved by designing a diatomic meta-molecule, which enables the independent control of the nonlinear geometric phase, polarization, and intensity of second harmonic waves. The proposed nonlinear diatomic metasurface provides an ultracompact platform for implementing multidimensional optical information encoding and may hold great potential in optical information security and optical anticounterfeiting.
在线性光学中，超表面因其能够利用亚波长超原子以前所未有的能力操纵光波的强度、偏振和相位，而成为编码光学信息的理想平台。然而，在非线性光学中控制光的各种自由度仍然难以实现。在此，我们提出一种工作在近红外波段的非线性等离子体超表面，它可以同时在实空间和傅里叶空间中编码光学图像。这是通过设计一种双原子超分子来实现的，该超分子能够独立控制二次谐波的非线性几何相位、偏振和强度。所提出的非线性双原子超表面为实现多维光学信息编码提供了一个超紧凑平台，并且在光学信息安全和光学防伪方面可能具有巨大潜力。
