Enhanced Polarization-Multiplexed Metasurface Imaging for Secure Information Encoding

We propose an enhanced polarization-multiplexed metasurface imaging scheme integrated with a visual secret-sharing encryption strategy. Information-bearing images are encoded into a multilayer H-shaped metasurface, establishing the first physical layer of security. Subsequently, the image content is converted into a global encryption key and corresponding user-specific subkeys through pixel overlay, forming the second information layer of protection. To validate the proposed scheme, metasurface samples are fabricated, and experimental results demonstrate robust reconstruction of encrypted images with high fidelity and low crosstalk under different polarization states. This method provides a promising solution for millimeter-wave imaging, physical-layer secure communication, and intelligent encryption applications.