Chinese Optics Letters, 2023, 21 (2): 020003, Published Online: Feb. 27, 2023
Cascaded metasurface for separated information encryption [Invited]
Abstract
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.
Jiahao Wang, Guodong Zhu, Weiguo Zhang, Zhou Zhou, Zile Li, Guoxing Zheng. Cascaded metasurface for separated information encryption [Invited][J]. Chinese Optics Letters, 2023, 21(2): 020003.