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

Claim 29:
30. 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 as 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 metalens is mounted inverted with the passive pillars between the substrate and the planar face of the LED, such that the passive pillars extend from the substrate toward the planar face of the LED with a gap of less than 50 micrometers,
wherein a radius of the metalens is equal to or greater than a radius of the planar face of the LED, and
wherein a thickness of the substrate is less than 1 millimeter.