Four-channel metasurface for multiplexing images under two nonorthogonal polarization states  

作　　者：刘文远 卓奕州 肖莉琨 陈晨 尚书 刘宏展 蒙红云 王发强 杨湘波 韦中超 Wenyuan Liu;Yizhou Zhuo;Likun Xiao;Chen Chen;Shu Shang;Hongzhan Liu;Hongyun Meng;Faqiang Wang;Xiangbo Yang;Zhongchao Wei(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,School of Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,China)

机构地区：[1]Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,School of Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Optics Letters》2023年第9期124-130,共7页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC) (Nos.62175070 and 61774062);the Natural Science Foundation of Guangdong Province (No.2021A1515010352);the Science and Technology Program of Guangzhou (No.2019050001)。

摘　　要：By its unparalleled capacity to manipulate optical parameters,metasurfaces demonstrate the ability to simultaneously manipulate the amplitude and phase of incident light.Exhibiting both near-field nanoprinting images and far-field holography images is a quintessential illustration of this capability.In preceding investigations,image multiplexing commonly transpires within the single polarization state or orthogonal polarization states,thereby exhibiting a deficiency in terms of information security when contrasted with the nonorthogonal polarization states.In this research,a multifunctional metasurface with the capability of exhibiting four-channel images has been proposed by using a nanobrick as a quarter-wave plate.Through the adjustment of the orientation angles of each nanobrick,nanoprinting can be displayed under both linearly and circularly polarized light.Building on this,the propagation phase is combined with the geometric phase to generate diverse phase delays,enabling the metasurface to be multiplexed under two nonorthogonal polarization states to achieve four-channel image displays.Intriguingly,bidirectional nanoprinting and bidirectional holography can be achieved by altering the direction of incidence polarization states.The proposed metasurface platform can open new possibilities for creating compact multifunctional optical devices,while also enhancing applications in multichannel image displays,information anticounterfeiting,and encryption.

关 键 词：HOLOGRAPHY nanoprinting quarter-wave plate MULTIPLEXING 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]