Thin film optical waveguide
US4111523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1976 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Aug 3, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/035
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
It is known to form an optical waveguiding thin film on a substrate. For various practical reasons, it is often desired that an optical beam coupled to the film be laterally confined so as to propagate only in a longitudinal stripe portion of the film. As disclosed herein, this is accomplished by depositing spaced-apart elements in contact with one surface of the film to establish in a narrow longitudinal region of the film between the elements an effective index of refraction that is higher than the index of the remainder of the film. In this way a longitudinal waveguiding stripe is formed on the film without the necessity of irradiating, etching or otherwise directly treating the film itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.