Multidimensional multiplexing geometric phase metaholography

Meta-holograms, the computer-generated holograms assisted with nano-structured metasurfaces, promise efficient recording of light at the nanoscale.Adopting the multiplexing principle further bestows meta-holography with superb capacity for information storage and imaging applications.However, conventional meta-holograms mostly employ a single physical dimension to multiplex the holograms with incomplete light modulation, which imposes critical limitations on holography fidelity.To address this challenge, here we propose and experimentally demonstrate multi-dimensional multiplexing meta-holograms using full-modulation dielectric geometric-phase metasurfaces.Such metasurfaces enable simultaneous, independent, and arbitrary control of the amplitude, phase, and polarization of spatial light based on the geometric-phase principle, with broadband properties.Thanks to the full-modulation principle, the metasurfaces enable the meta-holograms to multiplex multiple holographic images with engineered patterns, polarizations, and directions, depending on the particular input and output conditions.Compared with the holograms acquired with incomplete light modulation, the designed meta-holograms not only inspire an accurate high-capacity information integration with low crosstalk and ideal energy uniformity, but can also facilitate complex multi-dimensional optical information broadcasting, anti-counterfeit, and encryption in compact optoelectronic devices.This work provides a full-modulation metasurface strategy for robust and scalable multi-dimensional multiplexing meta-holography.