Wavelength–polarization channel-matching strategy for multiplexed metasurface holography

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.