Optical recording head including an optical resonant cavity
US7365941B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2005 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Dec 24, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording head including a media heating device to write and read data to a heat sensitive optical media disk. The media heating device includes an optical energy resonant cavity that produces a high intensity near-field optical spot of subwavelength dimension. Optical energy is coupled into the resonant cavity through a waveguide that is placed proximate the cavity, and optical energy is coupled out of the cavity through an aperture that is placed proximate an antinode or post within the cavity. In reading data from the optical media, a photodetector is placed at the end of the waveguide. Optical energy emitted from the end of the waveguide is influenced by the reflectivity of the media data bit, and is interpreted as the data bit signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.