Patent ID: 11874476
Assignee: IMAGIA, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. An optical device, comprising:
a light-emitting diode (LED) to generate optical radiation at an operational wavelength with a Lambertian emission profile relative to a planar face thereof; and
a metalens positioned to modify the Lambertian emission profile of the optical radiation from the LED to have a modified transmission profile, the metalens comprising:
a substrate, and
a two-dimensional array of passive pillars that extend from the substrate with varying pillar diameters,
wherein a diameter of each pillar and a subwavelength interelement spacing between adjacent pillars are selected functions of the operational wavelength to provide a target phase gradient that modifies a divergent emission profile of the optical radiation from the LED to have the modified transmission profile,
wherein the planar face of the LED is rectangular and wherein the metalens has a rectangular aperture with a thickness of less than 1 millimeter.