Nanostructured optical element, depth sensor, and electronic device
Provided are a nanostructured optical element, a depth sensor, and an electronic device. The nanostructured optical element includes: a light source in which a plurality of laser sources irradiating light are configured as an array; a meta-pattern layer including a plurality of first nano-posts that are two-dimensionally configured while satisfying a sub-wavelength condition, wherein the plurality of first nano-posts are configured to change the light from the light source into structured light; and a deflecting layer between the light source and the meta-pattern layer, and configured to change a proceeding direction of the light to make the light from the light source be incident to the meta-pattern layer.
1. A nanostructured optical element comprising:
a light source in which a plurality of laser sources radiating light are configured as an array;
a meta-pattern layer including a plurality of two-dimensionally configured first nano-posts satisfying a sub-wavelength condition, the plurality of first nano-posts being configured to change the light from the light source into structured light;
a deflecting layer between the light source and the meta-pattern layer, the deflecting layer being configured to change a proceeding direction of the light to make the light from the light source incident to the meta-pattern layer; and
a peripheral material layer provided directly on the meta-pattern layer opposite to the deflecting layer, the peripheral material layer encapsulating the plurality of first nano-posts,
wherein each of the plurality of first nano-posts has a refractive index that is greater than a refractive index of the peripheral material layer by one (1) or more.
2. The nanostructured optical element of claim 1 , wherein the light source is one of a VCSEL laser, a Fabry-Perot type laser diode, and a distributed feedback (DFB) type laser diode.
3. The nanostructured optical element of claim 1 , wherein the deflecting layer comprises a convex lens or a Fresnel lens.
4. The nanostructured optical element of claim 1 , wherein the deflecting layer comprises a plurality of two-dimensionally configured second nano-posts satisfying the sub-wavelength condition.
5. The nanostructured optical element of claim 4 , further comprising:
a supporting layer between the meta-pattern layer and the deflecting layer,
wherein the meta-pattern layer is on a first surface of the supporting layer, and the deflecting layer is on a second surface of the supporting layer.
6. The nanostructured optical element of claim 1 , wherein the meta-pattern layer further comprises a supporting layer supporting the plurality of first nano-posts, and the meta-pattern layer has a refractive index that is greater than a refractive index of the supporting layer by one (1) or more.
7. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts are configured as a hexagonal lattice or a rectangular lattice.
8. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts have asymmetric forms.
9. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts have multi-layered structures.
10. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts include a metal material.
11. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts are configured so that the structured light that passes through the meta-pattern layer does not overlap with one another in a spatial frequency domain.
12. The nanostructured optical element of claim 1 , wherein the plurality of first nano-posts are configured so that the structured light that passes through the meta-pattern layer overlaps with other structured light on a spatial frequency domain.
13. The nanostructured optical element of claim 1 , wherein the meta-pattern layer changes the light from the light source into structured light having one-dimensional periodical pattern or structured light having two-dimensional periodical pattern.
14. The nanostructured optical element of claim 1 , wherein the meta-pattern layer changes the light from the light source into structured light having random pattern.
15. The nanostructured optical element of claim 1 , further comprising:
an addressing unit configured to independently address the plurality of laser sources configured as an array.
16. A depth sensor comprising:
the nanostructured optical element of claim 1 configured to radiate the structured light to an object;
a light receiving sensor configured to receive the structured light reflected from the object; and
a controller configured to obtain distance information by analyzing the structured light received by the light receiving sensor.
17. An electronic device comprising the nanostructured optical element of claim 1 .
18. A nanostructured optical element comprising:
a light source in which a plurality of laser sources radiating light are configured as an array;
a meta-pattern layer including a plurality of two-dimensionally configured first nano-posts satisfying a sub-wavelength condition, the plurality of first nano-posts being configured to change the light from the light source into structured light; and
a deflecting layer between the light source and the meta-pattern layer, the deflecting layer being configured to change a proceeding direction of the light to make the light from the light source incident to the meta-pattern layer,
wherein the meta-pattern layer further comprises a supporting layer supporting the plurality of first nano-posts, and each of the plurality of first nano-posts has a refractive index that is greater than a refractive index of the supporting layer by one (1) or more.
19. The nanostructured optical element of claim 1 , wherein at least some of the plurality of first nano-posts have different shapes from each other.
20. The nanostructured optical element of claim 1 , wherein at least some of the plurality of first nano-posts have different widths or different heights from each other.