Diffraction grating comprising double-materials structures
US11573356B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2019 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Mar 7, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y20/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffraction grating includes a plurality of grating unit cells positioned in a periodic array on a substrate surface. In cross-section, a grating unit cell includes a homogeneous dielectric host medium with a first refractive index n1, embedding at least a first block of a first dielectric material with a second refractive index n2, a side edge of which is in direct contact with at least a second block of a second dielectric material with a third refractive index n3. Both the first block and the second block have a trapezoidal cross-section. The plurality of grating unit cells provides a non-symmetrical response for positive first diffraction order and negative first diffraction order based on nanojet hot spot positions, the nanojets being generated at edges between dielectric materials with different refractive indexes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.