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 dynam...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 phaseonly 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 metasurfacebased holography,and the compact system holds significant potential for applications in near-field computational imaging/detection,high-speed high-data-capacity nearfield wireless communication,and switchable meta-devices.展开更多
基金financial support from the National Natural Science Foundation of China(Grant Nos.61901242,62271170)the National Key Laboratory of Laser Spatial Information Foundation,and Frontier Science Center for Interaction between Space Environment and Matter Foundation.
文摘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 phaseonly 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 metasurfacebased holography,and the compact system holds significant potential for applications in near-field computational imaging/detection,high-speed high-data-capacity nearfield wireless communication,and switchable meta-devices.
