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Current microwave metasurfaces predominantly suffer from the disadvantages of optically opaque and phase-only modulation, which inevitably hinder their application potential. Herein, we have proposed a simple but efficient strategy for designing a multifunctional metasurface that is capable of simultaneously achieving visible transparency and microwave amplitude–phase manipulation. The designed meta-atom consists of a metal-frame-based H-shaped resonator and a metallic mesh layer separated by a transparent dielectric substrate, enabling eight-level phase modulation with a π/4 interval and continuous amplitude modulation covering the range of 0–0.9 at 16 GHz. As a proof-of-concept demonstration, a spatially multiplexed complex-amplitude hologram utilizing the designed meta-atom is simulated and experimentally validated. The results show that two distinct holographic images can be reconstructed in different imaging planes, and the measured average optical transmittance attains 63.7% at a wavelength range of 400–800 nm. Our proposed design strategy paves the way to an optically transparent microwave metasurface which is expected to have great potential in application scenarios requiring both visible transparency and microwave wavefront control.
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; Zhang Yaqiang 3 ; Jiang Xianwu 1 ; Zhang, Cheng 4 ; Dong Hongxing 4 ; Zhang, Long 4 1 Department of Physics, School of Physics and Mechanics, Wuhan University of Technology, Wuhan 430070, China; [email protected]
2 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; [email protected] (J.G.); [email protected] (Y.Z.); [email protected] (H.D.); [email protected] (L.Z.), Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
3 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; [email protected] (J.G.); [email protected] (Y.Z.); [email protected] (H.D.); [email protected] (L.Z.), Hangzhou Institute of Optics and Fine Mechanics, Hangzhou 311413, China
4 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; [email protected] (J.G.); [email protected] (Y.Z.); [email protected] (H.D.); [email protected] (L.Z.), Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China