System and method for fabricating polarization selective element
AssigneeMeta Platforms Technologies, LLC
InventorsYun-Han LEE, Mengfei WANG, Stephen CHOI, Kieran Connor KELLY, Lu LU, Kyle Justin CURTS
Life of this patent
Estimating the term…
Abstract
A system includes a surface relief grating configured to forwardly diffract an input beam as two linearly polarized beams. The system also includes a waveplate optically coupled with the surface relief grating and configured to convert the two linearly polarized beams into two circularly polarized beams having orthogonal circular polarizations. The two circularly polarized beams having orthogonal circular polarizations interfere with one another to generate a polarization interference pattern.
Claims22
A system, comprising:
- a light source configured to output a beam having a predetermined wavelength;
- a light deflecting element configured to deflect the beam output from the light source;
- a surface relief grating configured with a predetermined grating period, and configured to receive the beam deflected by the light deflecting element, and to forwardly diffract the beam incident thereon as two linearly polarized beams having orthogonal linear polarizations;
- and
- a waveplate optically coupled with the surface relief grating and configured to convert the two linearly polarized beams output from the surface relief grating into two circularly polarized beams having orthogonal circular polarizations,
- wherein the two linearly polarized beams form a first angle and a second angle with respect to a normal of a surface of the surface relief grating, respectively, and the first angle and the second angle have a substantially same non-zero absolute value and opposite signs, and
- wherein the two circularly polarized beams having orthogonal circular polarizations interfere with one another to generate a polarization interference pattern with a varying linear polarization, which is recordable in a polarization sensitive recording medium to define an orientation pattern of an optic axis of the polarization sensitive recording medium.
(canceled)
A method, comprising:
- generating, by a light source, an input beam having a predetermined wavelength;
- directing, by a light deflecting element, the input beam to a surface relief grating having a predetermined grating period;
- controlling, by a controller, the light deflecting element to adjust an incidence angle of the input beam incident onto the surface relief grating based on the predetermined wavelength and the predetermined grating period;
- forwardly diffracting, by the surface relief grating, the input beam as two linearly polarized beams having orthogonal linear polarizations, wherein the two linearly polarized beams form a first angle and a second angle with respect to a normal of a surface of the surface relief grating, respectively, and the first angle and the second angle have a substantially same non-zero absolute value and opposite signs;
- converting, by a waveplate, the two linearly polarized beams into two circularly polarized beams having orthogonal circular polarizations, the two circularly polarized beams interfering with one another to generate a polarization interference pattern with a varying linear polarization;
- and
- recording the polarization interference pattern in a polarization sensitive recording medium to define an orientation pattern of an optic axis of the polarization sensitive recording medium.
(canceled)
Dependencies are inferred from the claim text.