公开(公告)号：US20230417962A1

公开(公告)日：2023-12-28

申请号：US17103920

申请日：2020-11-24

申请人： Meta Platforms Technologies, LLC

发明人： Yun-Han LEE ,  Mengfei WANG ,  Stephen CHOI ,  Kieran Connor KELLY ,  Lu LU ,  Kyle Justin CURTS

IPC分类号： G02B5/18 ,  G02B27/28 ,  G03H1/04

CPC分类号： G02B5/1814 ,  G02B27/286 ,  G03H1/0402 ,  G03H2223/23 ,  G03H2227/05 ,  G03H2222/52

摘要： A system includes a surface relief grating configured to forwardly diffract an input beam as two linearly polarized beams. The system also includes a waveplate optically coupled with the surface relief grating and configured to convert the two linearly polarized beams into two circularly polarized beams having orthogonal circular polarizations. The two circularly polarized beams having orthogonal circular polarizations interfere with one another to generate a polarization interference pattern.

公开(公告)号：US20240085602A1

公开(公告)日：2024-03-14

申请号：US18513487

申请日：2023-11-17

申请人： Meta Platforms Technologies, LLC

发明人： Xiayu FENG ,  Sawyer MILLER ,  Mengfei WANG ,  Stephen CHOI ,  Lu LU ,  Barry David SILVERSTEIN

IPC分类号： G02B5/18 ,  G02B5/32

CPC分类号： G02B5/1871 ,  G02B5/32

摘要： A system is provided for generating a polarization interference pattern. The system includes a light source configured to output a first beam having a predetermined wavelength. The system includes a transmissive polarization volume hologram (“PVH”) mask configured to provide a predetermined diffraction efficiency to a second beam having the predetermined wavelength, a circular polarization, and a non-zero incident angle at the transmissive PVH mask. The system includes a light deflecting element disposed between the light source and the transmissive PVH mask, and configured to deflect the first beam as the second beam toward the transmissive PVH mask. The transmissive PVH mask is configured to forwardly diffract the second beam incident thereon as a third beam and a fourth beam having orthogonal circular polarizations, a substantially same light intensity, and symmetric propagation directions. The third beam and the fourth beam interfere with one another to generate the polarization interference pattern.

公开(公告)号：US20220317624A1

公开(公告)日：2022-10-06

申请号：US17217249

申请日：2021-03-30

申请人： Meta Platforms Technologies, LLC

发明人： Xingzhou TU ,  Yun-Han LEE ,  Mengfei WANG ,  Stephen CHOI ,  Lu LU

IPC分类号： G03H1/04 ,  G02B5/18 ,  G02F1/1337 ,  G03H1/02

摘要： A system includes a light outputting element configured to output a first beam propagating toward a beam interference zone from a first side of the beam interference zone. The system also includes a reflective assembly configured to reflect the first beam back as a second beam propagating toward the beam interference zone from a second side of the beam interference zone. The first beam and the second beam interfere with one another within the beam interference zone to generate a polarization interference pattern.