Fabrication method of a polarizing grating

Patent metadata

Field	Value
Publication number	US-10142602-B2
Application number	US-201715610038-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Mar 12, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A fabrication method of a polarization grating is provided. The method includes providing a polarization-sensitive material; and causing two orthogonally polarized lights to scan the polarization-sensitive material and to meet on the polarization-sensitive material.

First claim

What is claimed is:

1. A fabrication method of a polarization grating comprising:
providing a polarization-sensitive material;
providing two orthogonally polarized lights; and
causing the two orthogonally polarized lights to be reflected by two scanning mirrors respectively toward an incident position of the polarization-sensitive material and to scan the polarization-sensitive material along a direction, so as to form the polarization grating,
wherein the incident position is a convergence point of the two orthogonally polarized light on a surface of the polarization-sensitive material.

2. The fabrication method of the polarization grating according to claim 1 , wherein the two orthogonally polarized lights meet on the incident position of the polarization-sensitive material, and an included angle is formed between the two orthogonally polarized lights at the incident position.

3. The fabrication method of the polarization grating according to claim 1 further comprising:
emitting an original light; and
splitting the original light into the two orthogonally polarized lights.

4. The fabrication method of the polarization grating according to claim 3 , wherein the original light is a laser light.

5. The fabrication method of the polarization grating according to claim 3 , wherein the method of splitting the original light into the two orthogonally polarized lights comprises disposing a polarizing beam splitter on a path of the original light to split the original light into the two orthogonally polarized lights.

6. The fabrication method of the polarization grating according to claim 1 , wherein the polarization-sensitive material is a liquid crystal material.

7. The fabrication method of the polarization grating according to claim 1 further comprising:
converting the two orthogonally polarized light to orthogonally circularly polarized light.

8. The fabrication method of the polarization grating according to claim 7 , wherein the method of converting the two orthogonally polarized light to orthogonally circularly polarized light comprises disposing two quarter wave plates along a path of the two orthogonally polarized light respectively and between the polarizing beam splitter and the polarization-sensitive material.

Assignees

• Univ Hong Kong Sci & Tech
• Himax Display Inc

Inventors

• Kwok Hoi-Sing
• Tan Li
• Li Yuet-Wing

Classifications

• G02F1/13378

  by treatment of the surface, e.g. embossing, rubbing or light irradiation (G02F1/133711, G02F1/133734, G02F1/133753 take precedence) · CPC title

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• H04N9/3164

  using multiple light sources · CPC title

• H04N9/3167 Primary

  for polarizing the light beam (polarizing optical systems per se G02B27/28) · CPC title