Method for fabricating efficient sources of electromagnetic radiation
US6555293B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3558
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for fabricating periodically poled structures. The method produces an electric field within a ferroelectric substrate by applying a voltage waveform to an electrode structure disposed on a surface of the substrate. The waveform raises the electric field magnitude to a level substantially greater than that required to reverse domains within the substrate. The waveform then lowers the voltage such that the electric field has a value at which a domain wall velocity is most sensitive to changes in the field. The waveform maintains the electric field value until a current through the substrate drops substantially. The electric field is then lowered to a value below a level required to sustain domain wall motion, but greater than a level below which backswitching occurs. The electric field is then lowered to zero in such a way as to prevent backswitching. Alternatively, the electric field is maintained for a time t determined by t=x/v, where x is a domain wall half-width and v is a domain wall velocity. Subsequently, the waveforms lower the voltage to zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.