Flat minibands with spatially symmetric wavefunctions in intersubband superlattice light emitters
US6556604B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2000 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Feb 12, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/3407
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The RT regions of an ISB light emitter comprise pre-biased SLs and a multiplicity of split quantum wells (SPQWs). A SPQW is a quantum well that is divided into a multiplicity of sub-wells by a first barrier layer sufficiently thin that the upper and lower energy states are split beyond their natural broadening and contribute to different minibands in each RT region. In contrast, adjacent SPQWs are coupled to one another by second barrier layers. The thicknesses of the latter layers are chosen so that minibands are created across each RT region. In one embodiment, the emitter includes an I/R region between adjacent RT regions, and in another embodiment the I/R regions are omitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.