Open AccessDual‐Polarized Tri‐Channel Encrypted Holography Based on Geometric Phase Metasurface
Author(s) -
Wang Yue,
Guan Chunsheng,
Li Haoyu,
Ding Xumin,
Zhang Kuang,
Wang Jinxiang,
Burokur Shah Nawaz,
Liu Jian,
Wu Qun
Publication year - 2020
Publication title -
advanced photonics research
Language(s) - English
Resource type - Journals
ISSN - 2699-9293
DOI - 10.1002/adpr.202000022
Subject(s) - encryption , holography , computer science , channel (broadcasting) , multiplexing , phase (matter) , polarimetry , microwave , optics , polarization (electrochemistry) , scheme (mathematics) , dual (grammatical number) , electronic engineering , physics , engineering , mathematics , telecommunications , computer network , art , mathematical analysis , chemistry , literature , quantum mechanics , scattering
Metasurface‐based encrypted holography has drawn much attention recently due to its excellent ability in storing/displaying information with good security. To enhance the encryption security of metasurface holograms, multiplexing techniques, for which a large number of parameters need to be scanned to achieve the desired meta‐atoms, are highly demanded. Herein, a metasurface design scheme, which utilizes solely geometric phase elements to manipulate both co‐ and cross‐polarized reflected fields independently, is proposed. Using an improved weighted Gerchberg–Saxton (GSW), a holographic algorithm is proposed for 1‐bit phase, dual‐polarized tri‐channel encrypted metamirrors. Proof‐of‐concept prototypes are fabricated and experimental demonstrations are performed at microwave frequencies. Simulations and measurements are carried out to validate the proposed design, and the results agree well with the theoretical design scheme. Such dual‐polarized and tri‐channel encrypted metamirrors are appealing for applications in polarimetric imaging, information encryption/storage and beam splitting, shaping and steering.