基于双纳米孔的超表面全息成像

Metasurfaces Holographic Imaging Based on Dual Nanopores

为提高超表面的信息存储能力,从波长复用的角度出发,基于几何相位理论设计了一种由两种不同结构参数的椭圆纳米孔构成的超表面。利用时域有限差分法分析超表面的各参数的影响规律,通过超表面各个参数的调节,获得了530 nm和710 nm双工作波长下电磁波独立调控能力。并利用Gerchberg-Saxton算法对超表面的排布进行规划,利用该结果获得了同一位置双图像的呈现。530 nm处的成像图与原图像之间的均方误差约为0.082,710 nm处成像图与原图像之间的均方误差约为0.058,实现了超表面对于波长方面的双通道复用。

In order to improve the information storage ability of metasurfaces,from the perspective of wavelength multiplexing,this paper designs a metasurfaces composed of elliptical nanopores with two different structural parameters based on geometric phase theory.The Finite difference time domainmethod was used to analyze the influence law of each parameter of the metasurfaces,and the independent regulation ability of electromagnetic waves at 530 nm and 710 nm dual working wavelengths was obtained through the adjustment of each parameter of the metasurfaces.The Gerchberg-Saxton algorithm is used to plan the arrangement of metasurfaces,and the results are used to obtain the presentation of two images at the same location.The mean squared error between the imaging map at 530 nm and the original image is about 0.082,and the mean square error between the imaging image and the original image at 710 nm is about 0.058,realizing the dual-channel multiplexing of metasurfaces for wavelength.