Storage of optical information using photochiroptical effect
US5011756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is an optical information medium which permits the reading and writing of optical information by actively using polarized light. The optical information medium comprises an information layer containing a compound which undergoes a change upon irradiation with circularly polarized light to provide a new product which is optically active, and which is distinguishable from the original compound in its interaction with polarized light. In a preferred embodiment, the optical medium comprises optical isomers which can be selectively photolyzed by circularly polarized light. While writing must be done using a circularly polarized light source, reading of the recorded information can be accomplished using either circularly polarized light or linearly polarized light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.