Impact of exciton localization on the optical non-linearities of cavity polaritons

Citation
Dn. Krizhanovskii et al., Impact of exciton localization on the optical non-linearities of cavity polaritons, SOL ST COMM, 119(7), 2001, pp. 435-439
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
0038-1098 → ACNP
Volume
119
Issue
7
Year of publication
2001
Pages
435 - 439
Database
ISI
SICI code
0038-1098(2001)119:7<435:IOELOT>2.0.ZU;2-Q
Abstract
Polaritons in a semiconductor microcavity excited below the free exciton en ergy have been studied by pump-and-probe experiments. The excitation result s in a blue shift of the transmission peak of the lower polariton branch, f ollowed by a strong enhancement and narrowing. These changes are opposite t o those caused by high above band gap excitation. The strong differences be tween resonant and non-resonant excitation result from a different impact o f localized excitons and unbound carriers on the quantum well susceptibilit y. The experimental observations are modeled in the approximation of nonper turbative coupling of the exciton system to the cavity light field. (C) 200 1 Elsevier Science Ltd. All rights reserved.