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Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 82: Quantum dots and wires: Cavities and photons

HL 82.5: Talk

Thursday, March 14, 2013, 16:00–16:15, H2

Electrically driven adiabatic AlAs/GaAs Micropillar cavities — •Matthias Lermer1, Stephan Kuhn1, Niels Gregersen2, Jesper Mørk2, Christian Schneider1, Alfred Forchel1, Sven Höfling1, and Martin Kamp11Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Building 343, DK-2800 Kongens Lyngby, Denmark

Adiabatic Micropillar (MP) cavities are excellent testbeds for pronounced cavity quantum electrodynamic (cQED) effects. Due to the positive influence of the adiabatic mode transition in a taper region, this sort of MP cavities provide both, high Q factors and small mode volumes at the same time allowing e.g. for the observation of low threshold lasing and strong Quantum Dot (QD) - cavity coupling [1]. Moreover, for MP cavities in general, an elegant contacting routine is established [2] paving the way for daily use devices e.g. efficient single photon sources under electrical excitation [3]. We have carefully implemented a doping scheme for pin-Diode like, adiabatic MPs. High Q factors exceeding 10,000 have been measured in Photoluminescence (PL) and Electroluminescence (EL) and a distinct Purcell enhancement of a single QD line has been determined in a detuning experiment both in PL and EL. [1] M. Lermer et al., Physical Review Letters 108, 057402 (2012) [2] C. Böckler et al., Applied Physics Letters 92, 091107 (2008) [3] T. Heindel et al., Applied Physics Letters 96, 011107 (2010)

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