Method for preparation of single crystal films of organic second order optical materials
US6406647B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Feb 12, 1999 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Feb 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/54
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for preparation of single crystal films of organic second order optical materials, the films having controlled orientation and thickness. This method produces films of excellent optical quality and with large nonlinearities suitable for device applications. The material of interest is introduced into the interface of two optically flat solid substrates. The substrate surfaces are pretreated so that they are hydrophilic. The material is formed as a liquid phase (highly concentrated solution) in the interface. An external pressure is applied that brings the substrates close together and a shear is applied by moving one substrate with respect to the other while the substrates are held under a constant pressure. As a consequence of these interactions, oriented molecular clusters or nuclei are formed with the molecules organized in a specific direction with respect to the substrate-surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.