Wavelength-polarization channel-matching strategy for multiplexed metasurface holography.

Abstract

Joint wavelength-polarization multiplexing can increase the information capacity of metasurface holography, but scalable channel selection is limited by the mismatch between prescribed polarization states and the attainable birefringent dispersion of a meta-atom library. Here, we propose a wavelength-polarization channel-matching strategy that aligns the required birefringent phase difference with the intrinsic dispersion of the library. By reshaping polarization-evolution paths before hologram optimization, physically compatible wavelength-polarization channels are identified on an all-silicon mid-infrared metasurface. Scalar-diffraction calculations based on the FDTD-derived meta-atom library demonstrate multiplexed holographic reconstruction over seven joint wavelength-polarization channels spanning 2700-4675 nm. This strategy provides a route for high-dimensional metasurface holography and multichannel optical information encoding.