Optical element and system using the same
View Patent ↗An optical element may include a first diffractive structure having a radially symmetric amplitude function and a second diffractive structure having a phase function. The second diffractive structure may serve as a vortex lens. A system employing the optical element may include a light source and/or a detector.
1. An optical element, comprising:
a first diffractive structure having a radially symmetric amplitude function; and
a second diffractive structure having a phase function.
2. The optical element of claim 1 , wherein the first and second diffractive structures are on a same surface.
3. The optical element of claim 1 , wherein the first and second diffractive structures are on opposite surface of a same substrate.
4. The optical element of claim 3 , wherein a thickness of the same substrate determines a numerical aperture of the optical element.
5. The optical element of claim 1 , wherein the second diffractive structure is adapted to output light having corkscrew wave.
6. The optical element of claim 1 , wherein the first diffractive structure is adapted to focus light.
7. A system, comprising:
an optical element including a first diffractive structure having a radially symmetric amplitude function and a second diffractive structure having a phase function; and
a detector receiving light output from the optical element.
8. The system of claim 7 , wherein the first and second diffractive structures are on a same surface.
9. The system of claim 7 , wherein the first and second diffractive structures are on opposite surface of a same substrate.
10. The system of claim 9 , wherein a thickness of the same substrate determines a numerical aperture of the optical element.
11. The system of claim 7 , wherein the second diffractive structure is adapted to output light having corkscrew wave.
12. The system of claim 7 , wherein the first diffractive structure is adapted to focus light.
13. A system, comprising:
a light source outputting light having a symmetric wavefront; and
a vortex lens receiving light having the symmetric wavefront from the light source and outputting light having a corkscrew wave.
14. The system of claim 13 , wherein the vortex lens is a diffractive optical element.
15. The system of claim 13 , wherein the symmetric wavefront is a planar wavefront.
16. The system of claim 13 , further comprising a mount substrate for the light source and an optics substrate for the vortex lens.
17. The system of claim 16 , further comprising a spacer between the mount substrate and the optics substrate.
18. The system of claim 17 , wherein the spacer and the optics substrate enclose the light source.
19. The system of claim 13 , wherein the vortex lens is a lithograph.
20. The system of claim 19 , wherein the lithograph is a diffractive optical element.