Ultra-compact, aberration corrected, visible chiral spectrometer with meta-lenses
An optical device includes: (1) a substrate; and (2) multiple meta-lenses disposed on the substrate, each meta-lens of the meta-lenses including multiple nanofins disposed on a respective region of the substrate, the nanofins together specifying a phase profile of the meta-lens.
1. An optical device comprising:
a substrate; and
multiple meta-lenses disposed on the substrate, each meta-lens of the meta-lenses including multiple nanofins disposed on a respective region of the substrate, the multiple nanofins of each meta-lens together specifying a phase profile of the respective meta-lens.
2. The optical device of claim 1 , wherein at least two of the meta-lenses have different numerical apertures.
3. The optical device of claim 1 , wherein at least two of the meta-lenses have different off-axis focusing angles.
4. The optical device of claim 1 , wherein at least two of the meta-lenses have different focal lengths.
5. The optical device of claim 1 , wherein at least two of the meta-lenses are configured to focus light having different polarization states.
6. The optical device of claim 1 , wherein, for each meta-lens of the meta-lenses, the phase profile is achieved by positioning each nanofin on the substrate with a geometric rotation according to Pancharatnam-Berry phase.
7. The optical device of claim 1 , wherein a cross-section of at least one nanofin is rectangular.
8. The optical device of claim 1 , wherein a cross-section of at least one nanofin is elliptical.
9. The optical device of claim 1 , wherein the meta-lenses include an oxide, a nitride, a sulfide, a pure element, or a combination of two or more thereof.
10. A spectro-polarimeter comprising:
the optical device of claim 1 ; and
a camera adjacent to the optical device.
11. The spectro-polarimeter of claim 10 , configured to measure polarization and spectral information of an incident beam in a snapshot of the camera.
12. An optical device comprising:
a substrate; and
a plurality of meta-lenses disposed on the substrate, each of the plurality of meta-lenses including multiple dielectric elements disposed on the substrate, the dielectric elements of each of the plurality of meta-lenses together specifying a phase profile and a group delay of the respective meta-lens such that different wavelengths of an incident beam are focused off-axis on a common image plane.
13. The optical device of claim 12 , wherein each of the dielectric elements includes two nanofins spaced apart by a gap.
14. The optical device of claim 13 , wherein the two nanofins have geometric dimensions along a first axis that are substantially the same, and have geometric dimensions along a second axis that are different, wherein the second axis is orthogonal to the first axis.
15. The optical device of claim 13 , wherein the two nanofins have heights that are substantially the same, and have cross-section areas that are different.
16. The optical device of claim 12 , wherein the different wavelengths encompass a range of wavelengths of 50 nm or greater.
17. A spectro-polarimeter comprising:
the optical device of claim 12 ; and
a camera adjacent to the optical device.
18. The spectro-polarimeter of claim 17 , configured to measure polarization and spectral information of an incident beam in a snapshot of the camera.