Dispersion-engineered compact twisted metasurfaces enabling 3D frequency-reconfigurable holography
Cheng Pang, Yuzhong Wang, Pengcheng Wang, Axiang Yu, Yiding Liu, Ziang Yue, Mingshuang Hu, Jianqi Hu, Yongkang Dong, Jiaran Qi
Abstract
Abstract Flexible dispersion manipulation is critical for holography to achieve broadband imaging or frequency division multiplexing. Within this context, metasurface-based holography offers advanced dispersion control, Yet dynamic reconfigurability remains largely unexplored. This work develops a dispersion-engineered inverse design framework that enables 3D multi-plane frequency-reconfigurable holography through a twisted metasurface system. The physical implementation is based on a compact bilayer configuration that cascades the broadband radiation-type metasurface (RA-M) and phase-only metasurface (P-M). The RA-M provides a phase-adjustable input to excite P-M, while the rotation of P-M creates a reconfigurable response of holograms. By employing the proposed scheme, dynamic switching of space-frequency multiplexing and achromatic holograms is designed and experimentally demonstrated in the microwave region. This method advances flexible dispersion engineering for metasurface-based holography, and the compact system holds significant potential for applications in near-field computational imaging/detection, high-speed high-data-capacity near-field wireless communication, and switchable meta-devices.