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US 11,635,669 B1Granted
Optical device based on tunable polarization volume hologram
AssigneeMeta Platforms Technologies, LLC
InventorsLu Lu, Hao Yu, Mengfei Wang, Junren Wang, Yun-Han Lee, Nicholas John Diorio, Barry David Silverstein
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Abstract
A device includes a first substrate and a second substrate. The device also includes a birefringent medium layer disposed between the first substrate and the second substrate. Orientations of directors of optically anisotropic molecules included in the birefringent medium layer varying periodically with an in-plane pitch tunable by an external field to adjust a diffraction angle of a light beam diffracted by the birefringent medium layer.
Claims20
A device, comprising:
- a first substrate;
- a second substrate;
- and
- a polarization volume hologram (“PVH”) disposed between the first substrate and the second substrate, directors of optically anisotropic molecules included in the PVH being configured to rotate periodically in a predetermined direction with an in-plane pitch,
- wherein the optically anisotropic molecules form a plurality of flexodomains arranged in a spatially periodic pattern with a uniform pitch that is equal to the in-plane pitch, and
- wherein the in-plane pitch is tunable by an external field to adjust a diffraction angle of a light beam diffracted by the PVH.
3 more elements
A device, comprising:
- a polarization volume hologram (“PVH”) comprising optically anisotropic molecules with directors rotating periodically in a predetermined direction with an in-plane pitch,
- wherein the optically anisotropic molecules form a plurality of flexodomains arranged in a spatially periodic pattern with a uniform pitch that is equal to the in-plane pitch, and
- wherein the in-plane pitch is tunable by an external field to adjust a diffraction angle of a light beam diffracted by the PVH.
Dependencies are inferred from the claim text.