Active optical filter controlled by magnetic field
US7843622B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | May 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An active optical filter transmits or blocks light according to whether or not a magnetic field is applied, and functions as an optical filter transmitting light having a predetermined wavelength when light is transmitted according to a magnetic field. The active optical filter includes: an optical filter layer for transmitting or blocking light according to whether or not a magnetic field is applied; and a magnetic field applying unit surrounding the optical filter layer for applying a magnetic field to the optical filter layer. The optical filter layer has a multi-layer thin layer structure which is formed of two kinds of thin layers having different respective refractive indices and sequentially and periodically stacked on a substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.