Optical diffraction element
US7221515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2004 |
| Grant date | May 22, 2007 |
| Priority date | — |
| Expiry date | Jul 5, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical diffraction element (1) comprises a diffraction layer (4) which is divided into diffraction strips (6) alternating with intermediate strips (8). The diffraction strips comprise nano-elements (10) which are aligned in one direction and absorb radiation (b) which is linearly polarized in this direction. The diffraction element may be a linear or two-dimensional grating (1) or a Fresnel lens (160). The polarization-sensitive grating can be used in optical systems in which only radiation with a specific polarization direction should be diffracted, or in an optical record carrier to allow reading of an information structure with high spatial frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.