Reconfigurable Visible Holography at a Single Design Wavelength Enabled by an Sb₂S₃ Phase-Change Metasurface

Reconfigurable metasurface holography in the visible region is hindered by the trade-off between optical loss and phase tunability. We report a reconfigurable visible metasurface hologram operated at a fixed wavelength, enabled by the reversible phase transition of an Sb₂S₃ phase-change metasurface. The device integrates nonvolatile switching with complementary polarization multiplexing and a computationally optimized phase framework to achieve on-demand control of multiple holographic channels without altering geometry. In the crystalline state, two distinct images are reconstructed under orthogonal linear polarizations (x and y), whereas in the amorphous state, two additional images are activated under left- and right-handed circular polarizations (LCP and RCP). An iterative Fourier-Adam optimization establishes a shared base phase that maintains interchannel orthogonality, suppressing crosstalk and enhancing reconstruction fidelity. The low-loss, nonvolatile Sb₂S₃ platform provides a scalable route toward compact optical encryption and programmable visible photonics.