Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 7: Quantum dots and wires: Optical properties I
HL 7.8: Vortrag
Montag, 27. März 2006, 12:00–12:15, POT 151
Strong and weak coupling of quantum dot excitons in pillar microcavities — •Stephan Reitzenstein1, Carolin Hofmann1, Andreas Löffler1, Alexander Kubanek1, Johann Peter Reithmaier1,2, Martin Kamp1, Vladimir Kulakovskii3, Leonid Keldysh4, Thomas Reinecke5, and Alfred Forchel1 — 1Technische Physik, Universität Würzburg, Würzburg, Germany — 2Technische Physik, Universität Kassel, Kassel, Germany — 3Institute of Solid State Physics, RAS, Chernogolovka, Russia — 4Lebedev Physical Institute, RAS, Moscow, Russia — 5Naval Research Laboratory, Washington DC, USA
We report on strong as well as weak coupling of self assembled InGaAs quantum dots in high-Q semiconductor micropillar cavities. The micropillar cavities are based on a planar microcavity structure grown by molecular beam epitaxy. The planar structure consists of a GaAs λ-cavity centered between a lower and an upper distributed GaAs/AlAs Bragg reflector. In the center of the GaAs λ-cavity a low density layer of InGaAs QDs is introduced. By means of electron beam lithography and deep plasma etching we realized micropillars with Q-factors of about 5.000 to 35.000. The low quantum dot density allows us to investigate the interaction of single QD excitons and the vacuum field of the microcavity by temperature tuning. In addition to simple cases of strong coupling with a vacuum Rabi splitting of up to 140 µeV we will present examples of sequential coupling where QD excitons with different emission energies show strong or weak coupling with the optical mode of the same micropillar at different resonance temperatures.