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Four-Wave Mixing Holographic Multiplexing Based on Nonlinear Metasurfaces

机译：基于非线性超表面的四波混合全息复用

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摘要

Metasurfaces are utilized to realize computer-generated holograms (CGHs), with excellent wavefront shaping ability and ultrasmall footprint. To increase the information capacity of metasurface holograms, smart multiplexing techniques together with suitable designs are highly demanded. However, so far only a few approaches to achieve nonlinear metasurfaces holographic multiplexing based on CGHs are proposed, due to limited freedoms of multiplexing and proper metasurfaces' design. The nonlinear interaction of light with the metasurface can generate new frequencies compared to the input laser beam, which is promising to realize spectral and spatial multifunctional wavefront manipulation. Here, a four-wave mixing (FWM) holographic multiplexing technique is numerically proposed using a nonlinear metasurface composed of a nanoapertures array. It is demonstrated that the complex amplitude modulation by such a metasurface through the FWM process can be utilized for amplitude-only CGHs, which can process significantly independent information at different nonlinear frequencies in the optical regime. Utilizing the spatial and spectral multiplexing of nonlinear metasurfaces holography, they can be found applications for multidimensional holographic displays and can provide enhanced security for optical data storage. These results show that nonlinear metasurfaces are promising for applications of arbitrary frequency conversion and optical encryption and anticounterfeiting designs.
机译：超表面被用来实现计算机生成的全息图（CGH），具有出色的波阵面成形能力和超小尺寸。为了增加超表面全息图的信息容量，对智能多路复用技术以及合适的设计提出了很高的要求。然而，由于有限的复用自由度和适当的超颖表面的设计，到目前为止，仅提出了几种基于CGH的非线性超颖表面全息复用的方法。与输入激光束相比，光与超表面的非线性相互作用可以产生新的频率，这有望实现光谱和空间多功能波阵面操纵。在这里，使用由纳米孔阵列组成的非线性超表面，数字地提出了一种四波混合（FWM）全息复用技术。证明了通过FWM过程由这样的超表面进行的复杂幅度调制可以用于仅幅度的CGH，其可以在光学方案中的不同非线性频率下处理明显独立的信息。利用非线性超表面全息术的空间和光谱多路复用，可以发现它们在多维全息显示器中的应用，并且可以为光学数据存储提供增强的安全性。这些结果表明，非线性超表面对于任意频率转换，光学加密和防伪设计的应用前景广阔。

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