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HL: Fachverband Halbleiterphysik

HL 92: VCSELs, optical interconnects and Si photonics

HL 92.5: Talk

Thursday, March 19, 2015, 16:45–17:00, EW 202

Spontaneous and stimulated emission dynamics of quantum dot high-Q micropillar structures — •Sören Kreinberg¹, Elisabeth Schlottmann¹, Steffen Holzinger¹, Janik Wolters¹, Sven Höfling^2,3, Martin Kamp², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — ²Lehrstuhl für Technische Physik, Universität Würzburg, 97074 Würzburg, Germany — ³School of Physics & Astronomy, University of St Andrews, St Andrews, United Kingdom

Semiconductor microcavites are an ideal environment to study the fundamentals of light matter interaction down to the single emitter-single photon limit. Here, various effects like strong coupling or ultralow threshold lasing can be observed.

We present a comprehensive experimental study on the spontaneous and stimulated emission dynamics of InGaAs quantum dots embedded in high-Q micropillar cavities. While at low excitation powers the Purcell-enhanced spontaneous emission dominates the dynamics, a significant reduction of the emission lifetime indicates the onset of lasing at higher excitation powers.

Our results promise a better understanding of high-beta few-quantum-dot laser.