Device, method and apparatus for optical modulation using ferroelectric polymer liquid crystals
US4995705A · kind A · utility
52Cited by
9References
48Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1987 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Dec 16, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical modulation method comprises writing in a ferroelectric having a glass transition point at or above the glass transition point, and holding the resultant written state below the glass transition point. Preferably, the ferroelectric is formed in an optical modulation layer set to have an optical thickness capable of providing a multiple reflection state. The multiple reflection state of the optical modulation layer is locally changed at or above the glass transition point by irradiating the optical modulation layer under an electric field with a laser beam to write in the optical modulation layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.