Phase-Change Metasurfaces for Dynamic Image Display and Information Encryption

Optical metasurfaces enable us to engineer the electromagnetic space and control light propagation at an unprecedented level, offering a powerful tool achieve modulation of over multiple physical dimensions. Here, we demonstrate $\mathrm{Sb}$${}_{2}$$\mathrm{S}$${}_{3}$ phase-change metasurface platform that allows active manipulation both amplitude phase. In particular, implement dynamic nanoprinting holographic image display through tuning crystallization levels this material. The nanobricks tailored perform amplitude, geometric, propagation-phase constitute meta-atoms in multiplexed metasurfaces. Using incident polarizations as decoding keys, encoded information can be reproduced form nanoprinted grayscale near field two images far field. These switched on off by taking advantage reversible tunability nanostructure between amorphous crystalline states. proposed featuring manifold multifold encryption promise ultracompact data storage with high capacity security, which suggests exciting direction for modern cryptography security applications.