Metasurfaces with asymmetric gratings for redirecting light and methods for fabricating
US11360306B2 · kind B2 · utility
6Cited by
30References
26Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 2, 2020 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Jan 26, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0174
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system comprises an optically transmissive substrate comprising a metasurface which comprises a grating comprising a plurality of unit cells. Each unit cell comprises a laterally-elongated first nanobeam having a first width; and a laterally-elongated second nanobeam spaced apart from the first nanobeam by a gap, the second nanobeam having a second width larger than the first width. A pitch of the unit cells is 10 nm to 1 μm. The heights of the first and the second nanobeams are: 10 nm to 450 nm where a refractive index of the substrate is more than 3.3; and 10 nm to 1 μm where the refractive index is 3.3 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.