Granted Patent B2

US 12,298,473 · App. 18/419,183 · Granted May 13, 2025

Inventors: Christophe Peroz (San Francisco, CA); Kevin Messer (Ft. Lauderdale, FL)

Assignee: Magic Leap, Inc.

G02B1/115G02B6/0026G02B6/005G02B6/0076G02B27/0172G02B2005/1804G02B6/0065

Abstract

Claims (24)

1. An anti-reflective waveguide, comprising:

a planar waveguide substrate having a first index of refraction;

a plurality of diffractive optical elements disposed upon a first surface of the waveguide; and

an anti-reflective coating disposed upon a second surface of the waveguide, wherein the anti-reflective coating consists of four layers, wherein the waveguide is configured to propagate light by total internal reflection between the plurality of diffractive optical elements and the anti-reflective coating in a substantially first direction, and outcouple light in a second direction substantially orthogonal to the first direction.

2. The anti-reflective waveguide of claim 1 , wherein the light propagating by total internal reflection comprises an s polarization component and a p polarization component.

3. The anti-reflective waveguide of claim 2 , wherein the anti-reflective coating is configured to reduce phase retardation between the two components such that an angle of incidence of the s component is substantially similar to that of the p component through the waveguide.

4. The anti-reflective waveguide of claim 3 , wherein the anti-reflective coating reduces reflection from and increases transmission of light through the second surface into the waveguide.

5. The anti-reflective waveguide of claim 4 , wherein at least 97 percent of the light is transmitted through the second surface.

6. The anti-reflective waveguide of claim 2 , wherein the waveguide substrate is glass and the anti-reflective coating comprises a layer of MgF 2 .

7. The anti-reflective waveguide of claim 6 , wherein the layer of MgF 2 has a thickness between 75 and 125 nm.

8. The anti-reflective waveguide of claim 6 , wherein the anti-reflective coating comprises a layer of SiO 2 .

9. The anti-reflective waveguide of claim 7 , wherein the layer of MgF 2 is disposed immediately adjacent to the second surface.

10. The anti-reflective waveguide of claim 9 , wherein a layer of SiO 2 is disposed upon the layer of MgF 2 .

11. The anti-reflective waveguide of claim 10 , wherein a cumulative index of refraction of the anti-reflective coating has an imaginary refractive index component value less than 5×10 −4 .

12. The anti-reflective waveguide of claim 10 , wherein a cumulative index of refraction of the anti-reflective coating has an imaginary refractive index component value between 5×10 −4 and 1×10 −3 .

13. The anti-reflective waveguide of claim 2 , wherein the anti-reflective coating is between a first material and a second material.

14. The anti-reflective waveguide of claim 13 , wherein the first material has comparatively higher index of refraction than the second material.

15. The anti-reflective waveguide of claim 13 , wherein the first material is TiO 2 .

16. The anti-reflective waveguide of claim 13 , wherein each layer of TiO 2 has an index of refraction greater than 2.

17. The anti-reflective waveguide of claim 13 , wherein the second material is SiO 2 .

18. The anti-reflective waveguide of claim 17 , wherein each layer of SiO 2 has an index of refraction between 1.45 and 1.58.

19. The anti-reflective waveguide of claim 18 , wherein a cumulative index of refraction of the anti-reflective coating has an imaginary refractive index component value less than 5×10 −4 .

20. The anti-reflective waveguide of claim 18 , wherein a cumulative index of refraction of the anti-reflective coating has an imaginary refractive index component value between 5×10 −4 and 1×10 −3 .

21. The anti-reflective waveguide of claim 1 , wherein a cumulative index of refraction of the anti-reflective coating has an imaginary refractive index component value less than 5×10 −4 .

Assignments (4)

Continuity (5)

References Cited (400)