US 12,259,616 B1
Heliconical liquid crystal polarization hologram and device including the same
Nicholas John Diorio, Jr., Duvall, WA (US); Mengfei Wang, Woodinville, WA (US); Yuge Huang, Painted Post, NY (US); Kai-Han Chang, Troy, MI (US); Lu Lu, Kirkland, WA (US); and Xiayu Feng, 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 Oct. 30, 2023, as Appl. No. 18/498,001.
Int. Cl. G02F 1/13363 (2006.01); G02F 1/1335 (2006.01); G02F 1/1337 (2006.01); G02F 1/1343 (2006.01)
CPC G02F 1/133636 (2013.01) [G02F 1/133528 (2013.01); G02F 1/133753 (2013.01); G02F 1/134318 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A device, comprising:
a plurality of electrode layers;
a birefringent medium layer disposed between the plurality of electrode layers; and
at least one alignment structure disposed at a surface of the birefringent medium layer;
wherein the birefringent medium layer includes liquid crystal molecules arranged in a plurality of helical twist structures having a helical axis, and
wherein the plurality of electrode layers are configured to generate an electric field within the birefringent medium layer to align the liquid crystal molecules to be tilted with respect to the helical axis, and to align a direction of the helical axis extending throughout the birefringent medium layer to be parallel with a direction of the electric field.