Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationPhotoluminescence dynamics in GaAs/AlGaAs quantum wells under pulsed intersubband excitation
Zybell, S.; Schneider, H.; Winnerl, S.; Wagner, M.; Köhler, K.; Helm, M.
Abstract
We investigate the time-resolved photoluminescence (PL) dynamics of an undoped GaAs/AlGaAs multiple quantum well under mid-infrared (MIR) irradiation. A time-delayed MIR laser pulse from a free electron laser, tuned to the intersubband transition energy of the quantum well, induces temporal quenching of the PL intensity with subsequent recovery. The experimental data can be accurately described by a simple rate-equation model, which accounts for the cooling of the non-radiative states to radiative states. By performing polarization sensitive measurements, we are able to discriminate the contributions of free-carrier absorption from that of intersubband absorption, where the latter is about 50 times more efficient.
Keywords: semiconductor quantum well; intersubband excitation; time-resolved photoluminescence; photoluminescence quenching; rate equation model
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
Related publications
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 15610) publication
-
Applied Physics Letters 99(2011)4, 041103
DOI: 10.1063/1.3615298
Cited 15 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-15610