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US 10,670,782 B2Granted
Dispersionless and dispersion-controlled optical dielectric metasurfaces
AssigneeCalifornia Institute of Technology
InventorsEhsan Arbabi, Amir Arbabi, Seyedeh Mahsa Kamali, Yu Horie, Andrei Faraon
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Abstract
Metasurfaces comprise an array of pillars in a lattice. The dimensions of the pillars and the spacing are varied to obtain desired optical properties. The dispersionless metasurfaces can focus optical light over a broad wavelength range. Specific dispersion profiles for the metasurfaces can be designed. Gratings can be fabricated having similar properties as the array of pillars. Pillars in the metasurfaces can have different cross-section profiles.
Claims12
A method comprising:
- setting a desired phase and chromatic dispersion for a diffractive metasurface device having a desired functionality over a bandwidth;
- calculating a phase and chromatic dispersion of a scattering element for electromagnetic waves incident on the scattering element, as a function of wavelength of the electromagnetic waves, and as a function of geometrical dimensions of the scattering element;
- at a plurality of locations on the diffractive metasurface device, minimizing an error between the desired phase and chromatic dispersion of the diffractive metasurface device and the calculated phase and chromatic dispersion of the scattering element, the minimizing being by varying the geometrical dimensions of the scattering element;
- designing the diffractive metasurface device by arranging, at each location of the plurality of locations, a scattering element that minimizes the error;
- and
- fabricating the diffractive metasurface device according to the designing.
3 more elements
Dependencies are inferred from the claim text.