US 11,693,265 B2
Polarization modulator
Hsien-Hui Cheng, Redmond, WA (US); Yang Zhao, Kirkland, WA (US); Hannah Noble, Sunnyvale, CA (US); Fenglin Peng, Redmond, WA (US); and Lu Lu, Kirkland, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on May 26, 2021, as Appl. No. 17/330,422.
Prior Publication US 2022/0382080 A1, Dec. 1, 2022
Int. Cl. G02F 1/1347 (2006.01); G02F 1/01 (2006.01); G02B 27/01 (2006.01); G02F 1/139 (2006.01)
CPC G02F 1/0136 (2013.01) [G02B 27/0172 (2013.01); G02F 1/139 (2013.01); G02F 1/1347 (2013.01); G02B 2027/0178 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A polarization modulator comprising:
a first liquid crystal cell having a first type of liquid crystals configured to rotate an optical axis of light parallel to a first plane of the first liquid crystal cell;
a second liquid crystal cell configured to receive the light from the first liquid crystal cell, the second liquid crystal cell having a second type of liquid crystals configured to rotate the optical axis of the light perpendicular to a second plane of the second liquid crystal cell; and
a third liquid crystal cell configured to receive the light from the second liquid crystal cell, the third liquid crystal cell having the first type of liquid crystals configured to rotate the optical axis of the light parallel to a third plane of the third liquid crystal cell, and wherein the second liquid crystal cell is disposed between the first liquid crystal cell and the third liquid crystal cell.