Diffraction gratings formed by metasurfaces having differently oriented nanobeams
US12429636B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2022 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | Mar 28, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2223/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Metasurfaces provide compact optical elements in head-mounted display systems to, e.g., incouple light into or outcouple light out of a waveguide. The metasurfaces may be formed by a plurality of repeating unit cells, each unit cell comprising two sets or more of nanobeams elongated in crossing directions: one or more first nanobeams elongated in a first direction and a plurality of second nanobeams elongated in a second direction. As seen in a top-down view, the first direction may be along a y-axis, and the second direction may be along an x-axis. The unit cells may have a periodicity in the range of 10 nm to 1 μm, including 10 nm to 500 nm or 300 nm to 500 nm. Advantageously, the metasurfaces provide diffraction of light with high diffraction angles and high diffraction efficiencies over a broad range of incident angles and for incident light with circular polarization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.