Solid immersion lens with semiconductor material to achieve high refractive index
US6091694A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1998 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Sep 8, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An immersion system for a magneto-optical storage device has a spherical-segment-shaped lens. The lens is formed of material that is transparent to the electromagnetic radiation of the wavelength .lambda. at which the device is operated, and preferably of a semiconductor material. The lens has a first refractive index n.sub.1 which is greater than that of air. A layer with a higher refractive index than the lens is disposed in the propagation path of the electromagnetic radiation. The layer is composed of a material with a second refractive index n.sub.2 that is greater than the first refractive index n.sub.1 of the material of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.