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HL: Fachverband Halbleiterphysik
HL 58: Quantum Dots: Optical Properties IV
HL 58.2: Vortrag
Mittwoch, 22. März 2017, 15:15–15:30, POT 151
Linear and nonlinear spectroscopy of excitonic complexes in single self-assembled quantum dots — •Jens Kerski1, Annika Kurzmann1, Amran Al-Ashouri1, Patrick A. Labud2, Arne Ludwig2, Andreas D. Wieck2, Martin Geller1, and Axel Lorke1 — 1Faculty of Physics and CENIDE, Universität Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-Universität Bochum, Germany
The maximum resolution of images taken with an optical setup is given by Abbe’s diffraction limit. This can be overcome by using nonlinear processes as demonstrated by the semiconductor industry and in STED-microscopy.
In this work, we use linear and nonlinear photoluminescence spectroscopy to image a single self-assembled InAs/GaAs quantum dot (QD). In self-assembled QDs the recombination intensity of different excitonic radiative transitions depends nonlinearly on the excitation power. Due to this nonlinearity, we show here an increased spatial resolution of the optical imaging of a single QD. The experimental results are supported by empirical simulations, implemented for this work. This mechanism can easily be adapted to nanoparticles and other systems which exhibit a nonlinear dependence of their emitted radiation on the excitation power. Furthermore, an unexpected effect is observed indicating a specific angle dependence of the radiations of different excitonic states.