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US 11,714,320 B2Granted
Switchable broadband waveplate
AssigneeMeta Platforms Technologies, LLC
InventorsFenglin Peng, Lu Lu, Jacques Gollier
Life of this patent
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Abstract
A waveplate is provided. The waveplate includes a first liquid crystal (“LC”) layer including LC molecules that are in-plane switchable by an external field to switch the waveplate between states of different phase retardances. The waveplate includes a second LC layer and a third LC layer sandwiching the first LC layer. Azimuthal angles of effective refractive index ellipsoids of the second LC layer and the third LC layer are different.
Claims16
A waveplate, comprising:
- a first liquid crystal (“LC”) layer including first ferroelectric liquid crystal (“FLC”) molecules that are in-plane switchable by an external field to switch the waveplate between states of different phase retardances;
- and
- a second LC layer and a third LC layer sandwiching the first LC layer, wherein the second LC layer and the third LC layer include second FLC molecules, and wherein azimuthal angles of effective refractive index ellipsoids of the second LC layer and the third LC layer are different.
A waveplate, comprising:
- a first liquid crystal (“LC”) layer including LC molecules that are in-plane switchable by an external field to switch the waveplate between states of different phase retardances;
- and
- a second LC layer and a third LC layer sandwiching the first LC layer, wherein azimuthal angles of effective refractive index ellipsoids of the second LC layer and the third LC layer are different,
- wherein the LC molecules included in the first LC layer are first LC molecules, and the waveplate further comprises a fourth LC layer including second LC molecules that are in-plane switchable by the external field to switch the waveplate between the states of different phase retardances.
1 more element
A waveplate, comprising:
- a liquid crystal (“LC”) cell including LC molecules that are in-plane switchable by an external field to switch the waveplate between states of different phase retardances;
- and
- a first passive cell and a second passive cell sandwiching the LC cell, azimuthal angles of effective refractive index ellipsoids of the first passive cell and the second passive cell being different,
- wherein the LC molecules included in the LC cell include first ferroelectric liquid crystal molecules that are in-plane switchable by the external field, and
- wherein each of the first passive cell and the second passive cell includes second ferroelectric liquid crystal molecules.
2 more elements
Dependencies are inferred from the claim text.