Abstract
We investigate the time-resolved secondary emission of a
homogeneously broadened microcavity after resonant excitation. The
sample consists of a 25nm GaAs single quantum well (QW) in the
center of a wedged ¥ë cavity with AlAs/AlGaAs Bragg reflectors,
grown by molecular beam epitaxy. At zero detuning equal linewidths
of 180 ¥ìeV are observed for the three polariton modes. When
resonantly exciting the lower polariton mode, the seconfary
emission shows a strong directional dependence due to its large
in-plane dispersion. Four different components of the emission can
be distinguished. (i) strong coherent emission scattered in the
directions [110], [110] by nonresonant scattering of the
Bragg-mirrors. (ii) coherent emission scattered on a ring with
nearly constant in-plane momentum ©¤|k| by random disorder of the
QW or the mirrors. (iii) an incoherent emission on a similar ring,
possibly by photoluminescence of impurities. (iv) an incoherent
emission over a wide emission angle range, by photoluminescence of
QW excitons. The dynamics and the dependence on the excitation
condidtions and lattice temperature are presented and used to
identify the origin of the different components.
| Original language | English |
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| Title of host publication | Proceeding of Spring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft |
| Publication date | 2000 |
| Publication status | Published - 2000 |
| Event | Spring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft - Regensburg, Germany Duration: 22 Mar 2000 → 26 Mar 2000 |
Conference
| Conference | Spring Meeting of the Condensed Matter Division of the Deutsche Physikalische Gesellschaft |
|---|---|
| Country | Germany |
| City | Regensburg |
| Period | 22/03/2000 → 26/03/2000 |