基于介质超表面的圆偏振复用全息  

Circular polarization multiplexing holography based on dielectric metasurface

作　　者：万希智 孙雪平[1] 王望 刘卫国[1] WAN Xizhi;SUN Xueping;WANG Wang;LIU Weiguo(School of Opto-electronical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学光电工程学院,陕西西安710021

出　　处：《应用光学》2024年第3期630-636,共7页Journal of Applied Optics

基　　金：陕西省教育厅专项基金(22JK0415);陕西省自然科学基础研究(2022JQ-676)。

摘　　要：针对单一相位调控方式无法实现圆偏振复用问题,使用矩形硅砖结构,通过复合传输相位和几何相位,设计了一种工作在1.55μm下可以实现圆偏振复用全息的超表面。仿真结果表明,分别在左旋圆偏振光和右旋圆偏振光照射下,在远场可以观测到两幅清晰的全息图像,透过效率分别为60.8%和61.5%,偏振转化效率分别为79.1%和78.7%。设计的圆偏振复用超表面具有微弱串扰、两通道独立设计以及设计简单等优点,并且超表面元件体积小、重量轻、易于集成,在信息复用、信息存储或编码、防伪等方面具有较大的应用潜力。To solve the problem that circular polarization multiplexing cannot be realized by a single phase control mode,a rectangular silicon brick structure was used to design a metasurface that could realize circular polarization multiplexing holography at 1.55μm by combining transmission phase and geometric phase.The simulation results show that under the illumination of left circularly polarized light and right circularly polarized light,two clear holographic images can be observed in the far field,with transmission efficiency of 60.8%and 61.5%,and polarization conversion efficiency of 79.1%and 78.7%,respectively.The designed circularly polarized multiplexing metasurface has the advantages of weak crosstalk,independent design of two channels,and simple design.Moreover,the metasurface components are small in size,light in weight,easy to integrate,and have great application potential in information reuse,information storage or encoding,anti-counterfeiting,and other aspects.

关 键 词：全介质 超表面 相位调控 圆偏振复用 全息成像 

分 类 号：TN26[电子电信—物理电子学] O436[机械工程—光学工程]