Broadband achromatic flat optical components by dispersion-engineered dielectric metasurfaces
AssigneeThe Trustees of Columbia University in the City of New York
InventorsNanfang Yu, Adam Overvig, Sajan Shrestha
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Abstract
Techniques for creating a replacement for optical elements with diffractive planar components based on metasurfaces are provided. In one example, a substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase is provided.
Claims16
A substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase, comprising:
- a transparent substrate;
- and
- at least one metasurface, coupled to the substrate, comprising a plurality of optical meta-units to change at least the first phase to the second phase, wherein the plurality of optical meta-units comprises a plurality of singular pillars, a plurality of annular pillars, and a plurality of concentric rings, wherein each of the plurality of meta-units comprises silicon or TiO2;
- wherein each optical meta-unit of the plurality of optical meta-units is positioned at a distance that is less than the wavelength from at least a different optical meta-unit;
- wherein the flat optical component is adapted to correct both chromatic and monochromatic aberrations across the wavelength;
- wherein each of the plurality of meta-units comprises a meta-unit having a shape to diffractively scatter the electromagnetic radiation;
- wherein the shape comprises an archetype shape having one or more varying geometrical parameters;
- and
- wherein each of the plurality of meta-units is configured to provide a range of optical phase offset and phase dispersion for a broadband achromatic metasurface lens.
A method of making a substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase, comprising:
- positioning a transparent substrate;
- and
- forming at least one metasurface on the substrate comprising a plurality of optical meta-units to change at least the first phase to the second phase, wherein the plurality of optical meta-units comprises a plurality of singular pillars, a plurality of annular pillars, and a plurality of concentric rings, wherein each of the plurality of meta-units comprises silicon or TiO2;
- wherein each optical meta-unit of the plurality of optical meta-units is positioned at a distance that is less than the wavelength from at least a different optical meta-unit;
- wherein the flat optical component is adapted to correct both chromatic and monochromatic aberrations across the wavelength;
- wherein each of the plurality of meta-units comprises a meta-unit having a shape to diffractively scatter the electromagnetic radiation;
- wherein the shape comprises an archetype shape having one or more varying geometrical parameters;
- and
- wherein each of the plurality of meta-units is configured to provide a range of optical phase offset and phase dispersion for a broadband achromatic metasurface lens.
Dependencies are inferred from the claim text.