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1. WO2020112266 - NANOSTRUCTURES FOR OPTICAL DEVICES

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims:

1. A metasurface, comprising:

a nanostructure formed on a substrate, wherein the nanostructure is cuboidal or cylindrical in shape.

2. The metasurface of claim 1 , wherein the substrate comprises an array of nanostructures.

3. The metasurface of claim 2, wherein the nanostructures have round corners.

4. The metasurface of claim 2, wherein the nanostructures have different lateral dimensions.

5. The metasurface of claim 1 , wherein the nanostructure has a uniform lateral dimension.

6. The metasurface of claim 1 , wherein the nanostructure comprises a dielectric material.

7. The metasurface of claim 6, wherein the dielectric material is at least one of titanium dioxide, silicon nitride, amorphous silicon, crystalline silicon, gallium nitride, and aluminum zinc oxide.

8. The metasurface of claim 2, where the array of nanostructures are positioned at a gap away from each other, wherein the gap is greater than 35 nm.

9. The metasurface of claim 8, wherein the gap defined in a first group of nanostructures is greater than the gap defined in a second group of the nanostructure.

10. The metasurface of claim 8, wherein the gap defined between nanostructures is greater when the nanostructure has a higher height.

11. The metasurface of claim 9, wherein the gap is larger in the first group of the nanostructure when the nanostructures in the first group have higher refractive index.

12. The metasurface of claim 1 , further comprising:

an encapsulating layer encapsulating the nanostructure.

13. The metasurface of claim 1 , wherein the nanostructure has a refractive index greater than 1.8 and an absorption coefficient smaller than 0.001.

14. The metasurface of claim 2, wherein the arrays of the nanostructures provide all possible values of transmission phase between 0 and 2TT.

15. The metasurface of claim 2, wherein the arrays of the nanostructures provide a value of transmission amplitude close to 1.