Achromatic multi-zone metalens
An optical device includes a first zone including a first plurality of nanoscale elements. The first plurality of nanoscale elements has a first optical dispersion profile and a first orientation. The optical device has a second zone including a second plurality of nanoscale elements. The second plurality of nanoscale elements has a second optical dispersion profile and a second orientation. The first orientation and the second orientation are configured according to constructive interference for a plurality of wavelengths and a focal length.
1. An optical device, comprising:
a first zone comprising a first plurality of nanoscale elements, wherein the first plurality of nanoscale elements has a first optical dispersion profile and a first orientation; and
a second zone comprising a second plurality of nanoscale elements, wherein the second plurality of nanoscale elements has a second optical dispersion profile and a second orientation;
wherein the first orientation and the second orientation are configured according to constructive interference for a plurality of wavelengths and a focal length, and
wherein the first orientation and the second orientation are configured according to constructive interference for at least a first wavelength and a second wavelength.
2. The optical device of claim 1 , further comprising:
a third zone comprising a third plurality of nanoscale elements, wherein the third plurality of nanoscale elements has a third optical dispersion profile and a third orientation;
wherein the third orientation is configured according to constructive interference at the plurality of wavelengths and the focal length.
3. The optical device of claim 1 , further comprising:
a third zone comprising a third plurality of nanoscale elements, wherein the third plurality of nanoscale elements has a third optical dispersion profile and a third orientation;
wherein the first orientation, the second orientation, and the third orientation are configured according to constructive interference for at least the first wavelength, the second wavelength, a third wavelength, and the focal length.
4. The optical device of claim 1 , wherein:
the first optical dispersion profile depends on a shape of each of the first plurality of nanoscale elements; and
the second optical dispersion profile depends on a shape of each of the second plurality of nanoscale elements.
5. The optical device of claim 1 , wherein:
the first plurality of nanoscale elements has a first phase profile; and
the second plurality of nanoscale elements has a second phase profile;
wherein the first phase profile depends on a rotation of each of the first plurality of nanoscale elements; and
wherein the second phase profile depends on a rotation of each of the second plurality of nanoscale elements.
6. The optical device of claim 1 , wherein:
the first plurality of nanoscale elements has a first phase profile; and
the second plurality of nanoscale elements has a second phase profile;
wherein the first phase profile depends on a shape of each of the first plurality of nanoscale elements; and
wherein the second phase profile depends on a shape of each of the second plurality of nanoscale elements.
7. The optical device of claim 1 , wherein:
the first optical dispersion profile depends on a physical distribution of the first plurality of nanoscale elements; and
the second optical dispersion profile depends on a physical distribution of the second plurality of nanoscale elements.
8. The optical device of claim 1 , wherein a shape of the first zone is different from a shape of the second zone.
9. The optical device of claim 1 , wherein the first zone and the second zone are concentric rings.
10. The optical device of claim 1 , wherein the first plurality of nanoscale elements comprise at least one of titanium dioxide, silicon nitride, a polymer, an oxide, a nitride, a sulfide, a pure element, or a combination thereof.
11. The optical device of claim 1 , wherein the first plurality of nanoscale elements includes nanopillars.
12. The optical device of claim 1 , further comprising:
a transmissive substrate comprising glass or polymer, the first plurality of nanoscale elements and the second plurality of nanoscale elements disposed on the transmissive substrate.
13. A method of manufacturing an optical device, comprising:
disposing a first plurality of nanoscale elements in a first zone, wherein the first plurality of nanoscale elements has a first optical dispersion profile and a first orientation;
disposing a second plurality of nanoscale elements in a second zone, wherein the second plurality of nanoscale elements has a second optical dispersion profile and a second orientation; and
determining the first orientation and the second orientation based on constructive interference for a plurality of wavelengths and a focal length,
wherein the first orientation and the second orientation are configured according to constructive interference for at least a first wavelength and a second wavelength.
14. The method of claim 13 , further comprising:
determining a shape of each of the first plurality of nanoscale elements; and
determining a shape of each of the second plurality of nanoscale elements.
15. The method of claim 13 , further comprising:
determining a rotation of each of the first plurality of nanoscale elements; and
determining a rotation of each of the second plurality of nanoscale elements.
16. The method of claim 13 , further comprising:
determining a physical distribution of the first plurality of nanoscale elements; and
determining a physical distribution of the second plurality of nanoscale elements.
17. An augmented reality device, comprising:
a first zone comprising a first plurality of nanoscale elements, wherein the first plurality of nanoscale elements has a first optical dispersion profile and a first orientation;
a second zone comprising a second plurality of nanoscale elements, wherein the second plurality of nanoscale elements has a second optical dispersion profile and a second orientation; and
a waveguide for transmitting augmented reality information to the first zone and the second zone;
wherein the first orientation and the second orientation are determined based on constructive interference for a plurality of wavelengths and a focal length.
18. The augmented reality device of claim 17 , further comprising:
a third zone comprising a third plurality of nanoscale elements, wherein the third plurality of nanoscale elements has a third optical dispersion profile and a third orientation;
wherein the third orientation is configured according to constructive interference at the plurality of wavelengths and the focal length.
19. The augmented reality device of claim 17 , further comprising:
a third zone comprising a third plurality of nanoscale elements, wherein the third plurality of nanoscale elements has a third optical dispersion profile and a third orientation;
wherein the first orientation, the second orientation, and the third orientation are configured according to constructive interference for at least the first wavelength, the second wavelength, a third wavelength, and the focal length.