Anomalous carrier-induced dispersion in quantum-dot active media

H. C. Schneider, W. W. Chow, Stephan W Koch

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The complex optical susceptibility in a quantum-dot active medium is investigated theoretically. It is found that the Coulomb coupling of the localized discrete states in a quantum dot to extended continuum states in the surrounding quantum well region strongly influence optical properties under high excitation conditions. As a result, the behavior of the carrier-induced refractive index change δn differs significantly from that expected from the often used atomlike description, where the interaction between a quantum dot and the surrounding region involves only the transfer of electrons and holes. Furthermore, there is the possibility of increasing δn with increasing carrier density under conditions where laser gain is present, which is a distinct departure from bulk and quantum well behavior. Therefore, quantum-dot lasers may not show beam filamentation tendency, which has been a long-standing problem in semiconductor lasers.

Original languageEnglish (US)
Article number041310
Pages (from-to)413101-413104
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number4
StatePublished - Jul 15 2002
Externally publishedYes

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Semiconductor quantum dots
quantum dots
Semiconductor quantum wells
Quantum dot lasers
quantum wells
Carrier concentration
Semiconductor lasers
Refractive index
Optical properties
lasers
tendencies
Electrons
Lasers
semiconductor lasers
refractivity
continuums
magnetic permeability
optical properties
excitation
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Anomalous carrier-induced dispersion in quantum-dot active media. / Schneider, H. C.; Chow, W. W.; Koch, Stephan W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 4, 041310, 15.07.2002, p. 413101-413104.

Research output: Contribution to journalArticle

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