Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: Quantum dots: Microcavities and photonic crystals
HL 3.2: Vortrag
Montag, 25. Februar 2008, 11:30–11:45, ER 270
Electrically driven high–Q quantum dot–micropillar cavities — •Caroline Kistner1, Carolin Böckler1, Stephan Reitzenstein1, Ralph Debusmann1, Andreas Löffler1, Takayuki Kida1, Sven Höfling1, Alfred Forchel1, Laurent Grenouillet2, Julien Claudon2, and Jean-Michel Gérad2 — 1Technische Physik, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg — 2CEA-CNRS-UJF Nanophysics and Semiconductors Laboratory, CEA/DRFMC/SP2M, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
In recent years generating non-classical light and exploring Cavity Quantum Electrodynamic (CQED) effects in semiconductor quantum dot microcavity systems has become an active field of research due to possible applications in the field of quantum computing and cryptography. Here, we report on electrically driven high-Q quantum-dot micropillar cavities which are attractive in order to realize, e.g. compact and efficient single photon sources. In particular, a special lateral current injection scheme is presented which ensures an efficient light outcoupling through the uncapped upper facet of the micropillar. Applying this approach, quality factors up to 16000 were achieved for a 4 µm diameter microcavity. Furthermore, the structures feature excellent single quantum dot CQED effects with a Purcell enhancement larger than 10 for a micropillar with 2.5 µm diameter.