Metalens collimators and condensers
US11874476B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2023 |
| Grant date | Jan 16, 2024 |
| Priority date | — |
| Expiry date | Aug 16, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/002
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
According to various embodiments, a device may include a light-emitting diode (LED) to generate optical radiation at an operational wavelength with a divergent emission profile, such as a Lambertian emission profile, relative to a planar face thereof. A metalens may be positioned to modify the divergent emission profile of the optical radiation from the LED to have a modified transmission profile. The metalens may comprise, for example, a substrate and a two-dimensional array of passive pillars that extend from the substrate with a radially symmetric pattern of varying pillar diameters. The pillars may be spaced from one another according to a uniform subwavelength interelement spacing. The diameters of the pillars are selected as a function of the operational wavelength to provide a target phase gradient that modifies the divergent emission profile of the optical radiation from the LED to have the modified transmission profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.