Out-of-plane computer-generated multicolor waveguide holography

A multicolor waveguide holography system, comprising:

• a substrate;
• an optically transmissive material on the substrate, wherein the optically transmissive material is selected with a thickness and optical properties to function as a planar waveguide on the substrate to convey optical radiation along a length of the optically transmissive material;
• a grating coupler etched into the planar waveguide of optically transmissive material, the grating coupler to couple out-of-plane optical radiation of multiple colors into the planar waveguide of optically transmissive material, wherein the grating coupler is patterned to receive each color of multiple colors of optical radiation incident on the grating coupler at a different angle;
• and
• a metasurface hologram comprising a two-dimensional array of tunable subwavelength elements tunable between at least two states with different optical properties to decouple each color of the optical radiation conveyed by the planar waveguide of optically transmissive material for off-plane propagation to form a multicolor holographic image in free space.

A multicolor waveguide holography system, comprising:

• an optically transmissive planar waveguide to convey optical radiation along a length thereof;
• a grating coupler etched into the planar waveguide to couple out-of-plane optical radiation of multiple colors into the planar waveguide;
• and
• a metasurface hologram comprising a two-dimensional array of tunable subwavelength elements to decouple each color of the optical radiation conveyed by the planar waveguide to form a multicolor holographic image.