Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 82: Quantum dots and wires: Cavities and photons
HL 82.5: Vortrag
Donnerstag, 14. März 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 Kamp1 — 1Technische 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)