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US 10,408,416 B2Granted
Achromatic metalens and metalens with reverse chromatic dispersion
AssigneePresident and Fellows of Harvard College
InventorsMohammadreza Khorasaninejad, Zhujun Shi, Alexander Y. Zhu, Wei Ting Chen, Vyshakh Sanjeev, Federico Capasso
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Abstract
An optical device includes a substrate, a reflective layer disposed over the substrate, and a metalens disposed over the reflective layer. The metalens includes a plurality of nanopillars, the plurality of nanopillars together specifying a phase profile such that the metalens has a focal length that is substantially constant over a wavelength range of an incident light of about 490 nm to about 550 nm.
Claims16
An optical device comprising:
- a substrate;
- a reflective layer disposed over the substrate;
- and
- a metalens disposed over the reflective layer, wherein the metalens includes a plurality of nanopillars, the plurality of nanopillars together specifying a phase profile such that the metalens has a focal length that is substantially constant over a wavelength range of an incident light of about 490 nm to about 550 nm.
1 more element
An imaging system, comprising:
- a metalens structure, including:
- a substrate;
- a reflective layer disposed over the substrate;
- and
- a metalens disposed over the reflective layer, wherein the metalens includes a plurality of nanopillars, the plurality of nanopillars together specifying a phase profile such that the metalens has a focal length that is substantially constant over a wavelength range of an incident light of about 490 nm to about 550 nm;
- a beam splitter configured to receive the incident light reflected from the metalens, and reflect the received incident light;
- and
- an image sensor positioned to receive the incident light reflected by the beam splitter.
5 more elements
Dependencies are inferred from the claim text.