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HL: Fachverband Halbleiterphysik
HL 25: Quantum dots: Microcavities and microlaser
HL 25.2: Talk
Tuesday, March 17, 2015, 09:45–10:00, EW 203
Photon statistics excitation spectroscopy of a quantum dot micropillar laser — •Marc Aßmann1, Tomasz Kazimierczuk1, Johannes Schmutzler1, Christian Schneider2, Martin Kamp2, Sven Höfling2,3, and Manfred Bayer1,4 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Technische Physik, Physikalisches Institut, Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Germany — 3SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom — 4A. F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St Petersburg 194021, Russia
We propose photon-statistics excitation spectroscopy as an adequate tool to describe the optical response of a nonlinear system. To this end we suggest to use optical excitation with varying photon statistics as another spectroscopic degree of freedom. We apply photon-statistics excitation spectroscopy to a quantum dot micropillar laser. Both the intensity and the photon number statistics of the emission from the micropillar show a strong dependence on the photon statistics of the light used for excitation of the sample. The results under coherent and pseudothermal excitation reveal that a description of the laser properties in terms of mean input photon numbers is not sufficient. It is demonstrated that the micropillar acts as a superthermal light source when operated close to its threshold. Possible applications for important spectroscopic techniques like two-photon excited fluorescence in biological imaging are discussed.