Nonlinear Diatomic Metasurface for Real and Fourier Space Image Encoding
Nonlinear Diatomic Metasurface for Real and Fourier Space Image Encoding
复制标题
用于实数和傅里叶空间图像编码的非线性双原子超表面
DOI：
10.1021/acs.nanolett.0c02910
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发表时间：
2020-10-14
期刊：
影响因子：
10.8
通讯作者：
Li, Guixin
中科院分区：
文献类型：
--
作者：
Mao, Ningbin;Deng, Junhong;Li, Guixin
在线性光学中，超表面代表了编码光学信息的理想平台，因为它具有前所未有的利用亚波长超原子操纵光波的强度、偏振和相位的能力。然而，控制非线性光学中光的不同自由度仍然难以实现。在这里，我们提出了一种在近红外区域工作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对光学图像进行编码。这是通过设计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超紧凑平台，并且在光学信息安全和光学防伪方面具有巨大潜力。
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.