Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 82: Quantum dots and wires: Cavities and photons
HL 82.8: Vortrag
Donnerstag, 14. März 2013, 17:00–17:15, H2
Nonlinear emission characteristics of quantum dot - micropillar lasers in the presence of polarized optical feedback — •Caspar Hopfmann1, Ferdinand Albert2, Christan Schneider2, Sven Höfling2, Martin Kamp2, Alfred Forchel2, Ido Kanter3, and Stephan Reitzenstein1 — 1Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany — 2Technische Physik, Universität Würzburg, D-97074 Würzburg, Germany — 3Minerva Center and Department of Physics, Bar-Ilan University, Ramat Gan, 52900 Israel
Cavity quantum electrodynamics in high quality quantum dot (QD) microcavities has been subject of extensive research interest in recent years. In this field, nonlinear light-matter interaction and dynamical processes are of particular interest. We report on electrically pumped QD microlasers in presence of polarized external self-feedback. These high-β micropillar lasers feature Q-factors of up to 20000 and threshold currents of about 1 µA. Moreover, the lasers have two orthogonal linearly polarized fundamental modes which are coupled by the common few QD gain medium. This gain coupling is reflected in pronounced anti-correlations in the current dependence of the two mode components with respect to the output power, the coherence time and the second order photon autocorrelation function. By applying polarized self-feedback we are able to effectively control these emission characteristics. Additionally, self-feedback provides an attractive tool for inspection of light-matter interaction properties (i.e. Purcell factor and exciton lifetime) of the QDs at high excitation conditions.