US 12,422,609 B1
Planar-waveguide-based multi-channel crosstalk-free metasurface holographic device
Zeyang Liu, Wuhan (CN); Cheng Zhang, Wuhan (CN); Lingjie Jay Guo, Ann Arbor, MI (US); and Hao Gao, Wuhan (CN)
Assigned to Huazhong University of Science and Technology, Wuhan (CN); and The Regents of the University of Michigan, Ann Arbor, MI (US)
Filed by Huazhong University of Science and Technology, Wuhan (CN); and The Regents of the University of Michigan, Ann Arbor, MI (US)
Filed on May 24, 2024, as Appl. No. 18/673,466.
Int. Cl. G02B 6/35 (2006.01); F21V 8/00 (2006.01); G02B 6/293 (2006.01); G02B 6/38 (2006.01); G03H 1/00 (2006.01)
CPC G02B 6/0016 (2013.01) [G02B 6/29311 (2013.01); G02B 6/3522 (2013.01); G02B 6/3885 (2013.01); G03H 2001/0088 (2013.01); G03H 2223/16 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A holographic device, comprising a glass planar waveguide and a metasurface above the glass planar waveguide; light propagates inside the planar waveguide in the form of total internal reflection and illuminates the metasurface; the metasurface is capable of selectively projecting multiple crosstalk-free and independent holographic images according to different combinations of circular polarization state and azimuth angle of the total internal reflection incident light inside the waveguide; with total internal reflection light illumination, the metasurface-modulated light field of the holographic device is imparted an additional in-plane phase gradient to translate encoded target images between the propagation-wave region and the evanescent-wave region of k-space (spatial frequency space), therefore each target image can be selectively displayed free from crosstalk.