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US 11,215,881 B2Granted
Switchable broadband waveplate
AssigneeFacebook Technologies, LLC
InventorsFenglin Peng, Lu Lu, Jacques Gollier
Life of this patent
Estimating the term…
Abstract
An optical waveplate is provided. The optical waveplate includes a plurality of liquid crystal (“LC”) layers stacked together. At least one of the plurality of LC layers includes LC molecules that are in-plane switchable by an external field to switch the optical waveplate between states of different phase retardances.
Claims18
An optical waveplate, comprising:
- a stack of a plurality of liquid crystal (“LC”) layers including a first LC layer and a second LC layer,
- wherein the first LC layer includes LC molecules that are in-plane switchable by an external field to switch the optical waveplate between states of different phase retardances, and
- wherein when the optical waveplate operates at a substantially zero phase retardance state, an absolute value of a difference between an azimuthal angle of an effective refractive index ellipsoid of the first LC layer and an azimuthal angle of the effective refractive index ellipsoid of the second LC layer is 90°.
An optical lens assembly, comprising:
- an optical lens;
- and
- an optical waveplate coupled with the optical lens,
- wherein optical waveplate includes:
- a stack of a plurality of liquid crystal (“LC”) layers including a first LC layer and a second LC layer,
- wherein the first LC layer includes LC molecules that are in-plane switchable by an external field to switch the optical waveplate between states of different phase retardances, and
- wherein when the optical waveplate operates at a substantially zero phase retardance state, an absolute value of a difference between an azimuthal angle of an effective refractive index ellipsoid of the first LC layer and an azimuthal angle of the effective refractive index ellipsoid of the second LC layer is 90°.
4 more elements
Dependencies are inferred from the claim text.