Wavelength and spin-decoupled metasurface based on single-parameter modulation.

Metasurfaces provide an unprecedented platform for precise and subwavelength-scale modulation of optical phases, leading to innovative advancements in wavefront shaping and holography devices. This study presents a single-layer umbrella-like metasurface capable of multichannel holography, encoded with both polarization and wavelength. By leveraging a unique chiral-assisted strategy, we achieve simultaneous decoupling of wavelength and spin states through single-parameter modulation. This approach circumvents the complex structure designs and multi-parameter adjustments typically required in previous methods. Numerical simulations confirm the effectiveness of this metasurface, demonstrating wavelength- and spin-decoupled phase modulation at 1550 and 980 nm. Furthermore, we successfully demonstrate a four-channel hologram operable in both transmission and reflection modes, showcasing the potential applications of this metasurface in compact functional integration, information encryption, and 3D displays. This work paves the way for the development of multifunctional optical devices with enhanced integration and performance.