Optically Reconfigurable Spin-Multiplexed Metasurface for Compatible Camouflage in Microwave, Infrared, and Visible Band

This study presents an innovative approach for designing a spin-multiplexed metasurface with multispectral camouflage. The proposed metasurface enables camouflage across the microwave, infrared, and visible spectra. Photoresistors were introduced into chiral meta-atoms to achieve light-dependent modulation of the amplitude and phase of right-handed circularly polarized (RCP) waves. For left-handed circularly polarized (LCP) waves, the phase is controlled by a hybrid phase mechanism, covering a full 2π range. By adopting holographic imaging and optically controlled reconfigurable amplitude–phase encoding, near- and far-field camouflage is achieved under the illumination of LCP and RCP waves. Subsequently, the indium tin oxide (ITO) film was patterned into a small square to facilitate infrared camouflage. Finally, the introduction of a transparent medium guarantees the optical transparency of the metasurface and demonstrates the feasibility of the optically reconfigurable approach. As a proof-of-concept, the proposed metasurface was simulated, fabricated, and experimentally validated. The results demonstrate that the proposed metasurface achieves light-driven reconfigurable amplitude–phase encoding and supports holographic imaging in the microwave band. The infrared stealth and high optical transmittance of the metasurface were also successfully confirmed. This work not only proposes a design strategy for multi-spectrum camouflage metasurfaces compatible with microwave, infrared, and visible light, but also highlights their significant potential for applications.