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US 2020/0348176 A1Published application
Folded metasurface hyperspectral imager
AssigneeCalifornia Institute of Technology
InventorsMohammadSadegh FARAJI-DANA, Ehsan ARBABI, Andrei FARAON
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Abstract
Hyperspectal imagers including reflective and transmissive metasurfaces are disclosed. The described metasurfaces are used collectively to disperse and focus light of different wavelengths and incident angles on a focal plane. The disclosed devices are compact and light, and can be used in systems and applications requiring stringent form factors.
Claims24
A hyperspectral imager (HSI) comprising:
- a first mirror with an input aperture and a second mirror with an output aperture, the first and the second mirror facing each other;
- and
- a plurality of reflective metasurfaces and a transmissive metasurface, the plurality of reflective metasurfaces and the transmissive metasurface being patterned on a side of the HSI closer to the second mirror, the transmissive metasurface being in correspondence of the output aperture;
- wherein:
- the input aperture is configured to input light of separate wavelengths received at incident angles;
- the first mirror and the second mirror are configured to reflect the light to generate a reflected light;
- the output aperture is configured to output the reflected light thus generating an output light;
- and
- a combination of the plurality of reflective metasurfaces and the transmissive metasurface is configured to split the light into the separate wavelengths and to focus the output light to a plurality of spots on a focal plane.
6 more elements
A method of hyper spectral imaging comprising:
- receiving light through an input aperture of a first mirror;
- scattering the light off reflective metasurfaces located close to or on a second mirror facing the first mirror;
- reflecting the scattered light off the first and the second mirror, thereby splitting the scattered light into separate wavelengths, and
- outputting the light split into separate wavelengths through a transmissive metasurface located close to or on the second mirror via an output aperture of the second mirror.
1 more element
A method of building a hyperspectral sample, comprising:
- providing a one to one correspondence of transmission spectra of a nanopost with dimensions of the nanopost;
- and
- fabricating an array of nanoposts based on a set shape with set color variations, and the one to one correspondence.
Dependencies are inferred from the claim text.