公开(公告)号：US20220365482A1

公开(公告)日：2022-11-17

申请号：US17322453

申请日：2021-05-17

Applicant: Meta Platforms Technologies, LLC

Inventor： Hao YU ,  Dianmin LIN ,  Lu LU ,  Xiayu FENG ,  Mengfei WANG ,  Barry David SILVERSTEIN

IPC: G03H1/02 ,  G02B27/00 ,  G03H1/18 ,  G02B27/01

Abstract: An optical device includes an optical component (e.g., a polarization volume hologram, a geometric phase device, or a polarization-insensitive diffractive optical element) having a uniform thickness and configured to modify a wavefront of a light beam that includes light in two or more wavelengths visible to human eyes, where the optical component has a chromatic aberration between the two or more wavelengths. The optical device also includes a metasurface on the optical component. The metasurface includes a plurality of nanostructures configured to modify respective phases of incident light at a plurality of regions of the metasurface, where the plurality of nanostructures is configured to, at each region of the plurality of regions, add a respective phase delay for each of the two or more wavelengths to correct the chromatic aberration between the two or more wavelengths.

公开(公告)号：US20230194882A1

公开(公告)日：2023-06-22

申请号：US17553739

申请日：2021-12-16

Applicant: Meta Platforms Technologies, LLC

Inventor： Hao YU ,  Qing CHAO ,  Lu LU ,  Xinqiao LIU

IPC: G02B27/01 ,  G02B27/28 ,  G03H1/02 ,  G02B6/34 ,  G06F3/01

CPC classification number: G02B27/0179 ,  G02B27/0172 ,  G02B27/286 ,  G03H1/0248 ,  G02B6/34 ,  G06F3/013 ,  G02B2027/0174 ,  G02B2027/0178 ,  G02B2027/0187

Abstract: An eye-tracking system includes a substrate transparent to visible light and configured to be placed in a field of view of an eye of a user, a plurality of waveguides on the substrate, a light source optically coupled to the plurality of waveguides, and a plurality of polarization volume holograms (PVHs) in the field of view of the eye of the user. Each PVH of the plurality of PVHs is optically coupled to a respective waveguide of the plurality of waveguides and is configured to couple a respective light beam out of the respective waveguide towards the eye of the user.