Nonlocal metasurface structures and optical combiners

Abstract

This disclosure provides a nonlocal metasurface structure comprising a substrate and a waveguide grating layer disposed on the substrate. One side of the waveguide grating layer has a grating structure opposite to the substrate. This one-dimensional grating structure has a grating period of 820 nm to 920 nm. Within the grating period, the grating structure includes a first linear structure with a first width, a second linear structure with a second width, a third linear structure with a third width, and a fourth linear structure with a fourth width. The first width differs from the second, third, and fourth widths, the fourth width differs from the second and third widths, and the second and third widths may be the same as or different.

Claims

1. A nonlocal hyperlink interface structure, comprising: One substrate; A waveguide grating layer is disposed on the substrate. One side of the waveguide grating layer has a grating structure opposite to the substrate. The grating structure has a grating period of 820 nanometers to 920 nanometers. In the grating period, the grating structure includes a first linear structure with a first width, a second linear structure with a second width, a third linear structure with a third width, and a fourth linear structure with a fourth width. The first width is different from the second width, the third width, and the fourth width. The fourth width is different from the second width and the third width. The second width is the same as or different from the third width.

2. The nonlocal hypersurface interface structure as described in claim 1, wherein the first width is 80 nm to 120 nm, the second width is 21 nm to 61 nm, the third width is 21 nm to 61 nm, and the fourth width is 43 nm to 83 nm.

3. The nonlocal super-interface structure as described in claim 1, wherein the first linear structure and the second linear structure are spaced by a first distance of 52 nm to 92 nm, the second linear structure and the third linear structure are spaced by a second distance of 179 nm to 219 nm, the third linear structure and the fourth linear structure are spaced by a third distance of 180 nm to 220 nm, and the fourth linear structure and the first linear structure of the next cycle are spaced by a fourth distance of 134 nm to 174 nm.

4. The nonlocal meta-interface structure as described in claim 1, wherein the waveguide grating layer has a first height of 515 nm to 615 nm, and the grating structure has a second height of 110 nm to 210 nm.

5. The nonlocal meta-interface structure as described in claim 1, wherein the substrate comprises silicon dioxide and the waveguide grating layer comprises titanium dioxide, or the substrate comprises aluminum oxide and the waveguide grating layer comprises gallium nitride.

6. A nonlocal hyperlink interface structure, comprising: One substrate; A waveguide grating layer is disposed on the substrate. The waveguide grating layer includes a waveguide and a grating structure. The waveguide directly contacts the substrate, and the grating structure protrudes from the waveguide. The grating structure has a grating period and a nonlinear pattern within the grating period.

7. The nonlocal meta-interface structure as described in claim 6, wherein the grating period has a first directional length in a first direction and a second directional length in a second direction, the first direction being perpendicular to the second direction, the first directional length being 820 nm to 920 nm, and the second directional length being 226 nm to 306 nm.

8. The nonlocal hyperface interface structure as described in claim 7, wherein the nonlinear pattern has an axis of symmetry parallel to the first direction, and the axis of symmetry is located at half the length of the second direction.

9. The nonlocal meta-interface structure as described in claim 6, wherein the grating period has a first directional length in a first direction and a second directional length in a second direction, the first direction being perpendicular to the second direction, the first directional length being 820 nm to 920 nm, and the second directional length being 359 nm to 439 nm.

10. The nonlocal hyperface interface structure as described in claim 9, wherein the nonlinear pattern has an axis of symmetry parallel to the first direction, and the axis of symmetry is located at half the length of the second direction.

11. The nonlocal hyperface interface structure as described in claim 9, wherein the nonlinear pattern is an asymmetric pattern.

12. A light synthesizer, comprising: Nonlocal super-interface structures as described in any of claims 1 to 11.

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