Fig. 4

Angle-multiplexed metasurface holography. a The concept of proposed angle-multiplexed metasurface. Two independent holographic images can be reconstructed under illuminating with TE-polarized light at different incident angle [78]. b Metasurfaces for multiple printing-images switching and encoding based on coherent pixel method. Schematic of the designed coherent pixel is shown on the left panel. The intensity of each pixel can be considered as the coherent superposition of contributions by all elements within it. Three different images can be switched under arbitrary optical conditions based on demonstrated metasurface composed of coherent pixels [79]. c Schematic diagram of the angle-multiplexed metasurface. Different holographic images can be encoded into different polarization channels at target incident angles [80]