Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Quantum dots: Optical properties II

HL 29.2: Vortrag

Mittwoch, 25. März 2009, 09:45–10:00, BEY 154

Demonstration of strong coupling via electro-optical tuning in high quality QD-micropillar systems — •Caroline Kistner, Tobias Heindel, Christian Schneider, Arash Rahimi-Iman, Stephan Reitzenstein, Sven Höfling, and Alfred Forchel — Technische Physik, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg

The investigation of cavity quantum electrodynamics effects such as strong coupling in optically pumped QD-microcavity systems has become an active area of research in recent years. Up to now, most of the experiments employed a temperature change of the sample in order to tune a QD exciton line through resonance with the cavity mode. This limits the tuning speed to the range from kHz to MHz due to the thermal relaxation time of the structures. Recent progress in the fabrication of electrically contacted micropillar cavities enabled us to develop a reversible and fast electro-optical resonance tuning technique. Electro-optical tuning exploits the quantum confined Stark effect (QCSE) and paves the way for fast optical switches operating in the GHz range. Making use of the QCSE we tuned a QD emission line through resonance with a high quality (Q) cavity mode (Q=14,000) by applying a reverse bias to the p-i-n structure and observed of strong coupling associated with a vacuum Rabi-Splitting of 63 µeV.