On-chip integrated metasystem for spin-dependent multi-channel color holography

On -chip integrated metasurface driven by in -plane guided waves is of great interests in various light -field manipulation applications such as colorful augmented reality and holographic display. However, it remains a challenge to design colorful multichannel holography by a single on -chip metasurface. Here we present metasurfaces integrated on top of a guided -wave photonic slab that achieves multi -channel colorful holographic light display. An end -to -end scheme is used to inverse design the metasurface for projecting off -chip preset multiple patterns. Particular examples are presented for customized patterns that were encoded into the metasurface with a single -cell meta -atom, working simultaneously at RGB color channels and for several different diffractive distances, with polarization dependence. Holographic images are generated at 18 independent channels with such a single -cell metasurface. The proposed design scheme is easy to implement, and the resulting device is viable for fabrication, promising plenty of applications in nanophotonics. (c) 2024 Optica Publishing Group