Tunable Full-Color Vectorial Meta-Holography

Vectorial metasurface holograms ar realized through segmenting or interleaving nanostructures to modulate spatial polarization of the reconstructed holography on the imaging plane, but it is still a challenge to achieve full-color vectorial meta-holograms with subwavelength meta-molecules and independent spatial polarization control of reconstructed images. Here, this problem is solved by multiplexing the hologram phase for one circularly polarized light and the conjugated hologram phase for another orthogonal circularly polarized light using only a single nanostructure and then interleaving three kinds of metasurfaces for red, green, and blue light in subwavelength meta-molecules. By independent control of the phase difference of two overlapped circularly polarized holographic images for each color, the vectorial field on the imaging plane can be freely manipulated at the pixel scale and dynamically changed with the incident polarization. Therefore, the local color and even contrast of the reconstructed full-color image can be tuned by selecting the incident and output polarization states, demonstrating great potentials in secure optical encryption and dynamic color display.