摘要
For a conventional cascaded metasurface,the combination channel and each single channel are mutually dependent because the phase modulation of a cascaded metasurface is the sum of each single one.Here we propose a cascaded metasurface that can independently encode information into multiple channels.Based on the orientation degeneracy of anisotropic metasurfaces,each single metasurface can produce a quick-response(QR)image in the near field,governed by the Malus law,while the combined channel can produce a holographic image in the far field,governed by geometric phase.The independent and physically separated trichannel design makes information encryption safer.
作者
汪嘉豪
朱国栋
张为国
周舟
李子乐
郑国兴
Jiahao Wang;Guodong Zhu;Weiguo Zhang;Zhou Zhou;Zile Li;Guoxing Zheng(Electronic Information School,Wuhan University,Wuhan 430072,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Peng Cheng Laboratory,Shenzhen 518055,China;Wuhan Institute of Quantum Technology,Wuhan 430206,China)
基金
supported by the National Key Research and Development Program of China(No.2021YFE0205800)
the National Natural Science Foundation of China(Nos.12174292,11904267,and 91950110)
the Fundamental Research Funds for the Central Universities(Nos.2042022kf1013,2042022kf0024,and 2042021kf0018)。
