Patterned anisotropic films and optical elements therewith

Patent metadata

Field	Value
Publication number	US-12092850-B2
Application number	US-202017073249-A
Country	US
Kind code	B2
Filing date	Oct 16, 2020
Priority date	Apr 17, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A first layer of anisotropic material extends along a first plane and includes anisotropic components being parallel to a second plane non-parallel and non-perpendicular to the first plane. The anisotropic components are arranged in cycloidal or helical patterns. The cycloidal or helical patterns define one or more Bragg planes that are non-parallel and non-perpendicular to the first plane and either substantially parallel or substantially perpendicular to the second plane.

First claim

What is claimed is:

1. An optical element, comprising:
a first layer of anisotropic material extending along a first plane and including cycloidal or helical patterns non-parallel and non-perpendicular to the first plane, wherein each cycloidal or helical pattern includes a plurality of discrete anisotropic components, and the cycloidal or helical patterns of the anisotropic material define one or more Bragg planes that are either substantially parallel or substantially perpendicular to the cycloidal or helical patterns.

2. The optical element of claim 1 , wherein the optical element is one of: a grating, a lens, a beam splitter, a beam deflector, a disperser, a wavefront modifier, or an optical scanner.

3. An optical element, comprising:
a first layer of anisotropic material extending along a first plane and including cycloidal patterns non-parallel and non-perpendicular to the first plane, wherein the cycloidal patterns of the anisotropic material define one or more Bragg planes that are substantially perpendicular to the anisotropic material defining the cycloidal patterns, and the optical element is a transmissive optical element.

4. An optical element, comprising:
a first layer of anisotropic material extending along a first plane and including helical patterns non-parallel and non-perpendicular to the first plane, wherein the helical patterns of the anisotropic material define one or more Bragg planes that are substantially parallel to the anisotropic material defining the helical patterns, and the optical element is a reflective optical element.

5. The optical element of claim 2 , wherein:
the first layer of anisotropic material includes a first region having a first cycloidal or helical pattern, the first pattern defining a first Bragg plane of the one or more Bragg planes for redirecting a first portion of first light to a first direction.

6. The optical element of claim 5 , wherein:
the first layer of anisotropic material also includes a second region, distinct from the first region, having a second cycloidal or helical pattern distinct from the first cycloidal or helical pattern, the second pattern defining a second Bragg plane, non-parallel to the first Bragg plane, of the one of more Bragg planes for redirecting a second portion, distinct from the first portion, of the first light to a second direction distinct from the first direction.

7. The optical element of claim 6 , wherein:
the first portion of the first light and the second portion of the first light do not intersect with each other.

8. The optical element of claim 6 , wherein:
the first layer of anisotropic material also includes a third region, distinct from the first region and the second region, having a third cycloidal or helical pattern that corresponds to the first cycloidal or helical pattern, the third pattern defining a third Bragg plane, parallel to the first Bragg plane, of the one of more Bragg planes for redirecting a third portion, distinct from the first portion and the second portion, of the first light to the first direction.

9. The optical element of claim 6 , wherein:
respective regions of the first layer of anisotropic material have cycloidal or helical patterns for redirecting light impinging on the respective regions to intersect at a common focal point.

10. The optical element of claim 9 , wherein:
the first region and the second region are located at a first distance from a first axis passing through a geometric center of the optical element;
the first Bragg plane defined by the first region has a first angle relative to the first plane; and
the second Bragg plane defined by the second region has the first angle relative to the first plane.

11. The optical element of claim 9 , wherein:
the first region is at a first distance from a first axis passing through a geometric center of the optical element and being perpendicular to the first plane, and the second region is at a second distance greater than the first distance from the first axis; and
the first Bragg plane defined by the first region has a first angle relative to the first plane; and
the second Bragg plane defined by the second region has a second angle, distinct from the first angle, relative to the first plane.

12. The optical element of claim 9 , wherein:
the common focal point is located on a first axis passing through a geometric center of the optical element and being perpendicular to the first plane.

13. The optical element of claim 9 , wherein:
the common focal point is located away from a first axis passing through a geometric center of the optical element and being perpendicular to the first plane.

14. The optical element of claim 9 , wherein:
one or more regions, of the first layer of anisotropic material, having a first distance from a second axis perpendicular to the first plane have cycloidal or helical patterns for redirecting light impinging on the one or more regions having the first distance from the second axis to intersect at a first location on the second axis; and
one or more regions, of the first layer of anisotropic material, having a second distance, distinct from the first distance, from the second axis have cycloidal or helical patterns for redirecting light impinging on the one or more regions having the second distance from the second axis to intersect at a second location distinct from the first location on the second axis.

15. The optical element of claim 6 , wherein:
the first layer of anisotropic material includes a plurality of regions with respective cycloidal or helical patterns, and cycloidal or helical patterns of respective regions change continuously from cycloidal or helical patterns of adjacent regions, for modifying a wavefront of the first light.

16. The optical element of claim 1 , further including:
a second layer of anisotropic material extending along the first plane and optically coupled with the first layer of anisotropic material, the second layer of anisotropic material including cycloidal or helical patterns non-parallel and non-perpendicular to the first plane, wherein the cycloidal or helical patterns of the anisotropic material of the second layer of anisotropic material define one or more Bragg planes that that are either substantially parallel or substantially perpendicular to the one or more cycloidal or helical patterns of the second layer of anisotropic material.

17. The optical element of claim 16 , wherein:
the first layer of anisotropic material is for redirecting light having a first wavelength range while transmitting light having a second wavelength range distinct from the first wavelength range; and
the second layer of anisotropic material is for redirecting the light having the second wavelength range while transmitting the light having the first wavelength range.

18. The optical element of claim 16 , wherein:
the first layer of anisotropic material is for redirecting light having a first polarization while transmitting light having a second polarization that is distinct from the first polarization; and
the second layer of anisotropic material is for redirecting the light having the second polarization while transmitting the light having the first polarization.

19. The optical element of claim 1 , wherein:
the first layer of anisotropic material includes a first portion and a second portion, distinct from and adjacent to, the first portion; and
the anisotropic material in the first portion and the anisotropic material in the second portion have a corresponding alignment pattern

Assignees

• Meta Platforms Tech Llc

Inventors

• Lu Lu
• Feng Xiayu
• Wang Mengfei
• Yu Hao
• Li Ryan
• Lee Yun-Han
• Wang Junren
• Silverstein Barry David

Classifications

• G03H1/0248

  Volume holograms · CPC title

• G03H2001/0413

  for recording transmission holograms · CPC title

• G03H2001/0439

  for recording Holographic Optical Element [HOE] · CPC title

• G03H1/0402

  Recording geometries or arrangements (G03H1/0443, G03H1/0476, G03H1/16 take precedence) · CPC title

• G03H2260/12

  Photopolymer · CPC title