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Published on: September 25, 2020
Empowering dynamic reconfigurable OAM meta-switcher with a transmissive polarization-reconfigurable metasurface
Zhe Qin1,2, Yongfeng Li1,2, Kaihao Zhou1,2
1Department of Basic Sciences, Air Force Engineering University, Xi'an, Shaanxi 710051, China.
Abstract:
Dynamic control of polarization is vital for wireless communications, imaging, and information processing. Transmissive metasurfaces offer compact solutions but face limitations in reconfigurability: the performance of switches between co- and cross-polarization is severely limited in bandwidth and efficiency, and the function is isolated from independent phase control. Here, we propose a transmission-type reconfigurable polarization meta-converter enabling dynamic switching between co-polarization and cross-polarization transmission with high efficiency and broad bandwidth. Furthermore, 1-bit phase encoding (0° and 180°) is integrated for independent wavefront control. As a proof-of-concept, a dynamic orbital angular momentum (OAM) meta-switcher is demonstrated, which is capable of transmitting y-polarized waves and generating a focused OAM beam with a topological charge l = +2. Our work integrates dynamic polarization conversion with advanced wavefront engineering technology onto a single transmission-type platform, paving pathways for advanced applications such as synthetic aperture radar (SAR), polarization imaging, and 6G wireless communications.
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