US 12,265,358 B2
Out-of-plane computer-generated multicolor waveguide holography
David R. Smith, Durham, NC (US); Zhiqin Huang, Chapel Hill, NC (US); and Daniel L. Marks, Durham, NC (US)
Filed by Duke University, Durham, NC (US)
Filed on Jan. 3, 2023, as Appl. No. 18/149,253.
Application 18/149,253 is a division of application No. 16/459,045, filed on Jul. 1, 2019, granted, now 11,543,774.
Claims priority of provisional application 62/692,907, filed on Jul. 2, 2018.
Prior Publication US 2023/0141643 A1, May 11, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G03H 1/26 (2006.01)
CPC G03H 1/2645 (2013.01) [G03H 2222/13 (2013.01); G03H 2223/23 (2013.01); G03H 2225/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A dynamically reconfigurable multicolor waveguide holography system, comprising:
a multicolor light source to transmit multiple distinct colors of optical radiation at different angles;
a grating coupler to couple each of the distinct colors of optical radiation into a waveguide, wherein each color of optical radiation is incident on the grating coupler at a different angle of incidence;
a waveguide coplanar with the grating coupler to convey each color of the optical radiation from the grating coupler to a metasurface hologram with a distinct spatial frequency;
a dynamically reconfigurable metasurface hologram comprising a two-dimensional array of active subwavelength elements tunable between at least two states with different optical properties, wherein the metasurface hologram is coplanar with the grating coupler and the waveguide to decouple the distinct colors of optical radiation for off-plane propagation to form a target multicolor image as a hologram in free space; and
a controller to:
calculate a holographic pattern corresponding to the target multicolor holographic image, and
modify the dynamically reconfigurable metasurface hologram by tuning the active subwavelength elements to approximate the calculated holographic pattern.