Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.48: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Speeding up a single quantum dot pump-probe experiment — •Gerhard Johannes Schäfer1, Christian Dicken1,2,3, Christian Wolpert2,3, Armando Rastelli4,5, and Markus Lippitz1,2,3 — 1Experimentalphysik III, Universität Bayreuth, Bayreuth, Germany — 24th Physics Institute and Research Center SCOPE, University of Stuttgart, Stuttgart, Germany — 3Max Planck Institute for Solid State Research, Stuttgart, Germany — 4Institute for Integrative Nanosciences, IWF Dresden, Dresden, Germany — 5Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria
We recently showed [1], that it is possible to measure transient reflection on single semiconductor quantum dots in the far field. Here we discuss how to improve those measurements.
The lifetime of an excited quantum dot is around of 300 ps. The time delay between two laser pulses in the old setup (repetition rate 78 MHz) is 12 ns. By changing the laser system to another one with a higher repetition rate (1 GHz) we reduce this time delay to 1 ns.
We are interested in the characterization of a single quantum dot two-level system and its interaction with environment through transient absorption spectroscopy. We will add plasmonic structures to do antenna enhanced single quantum dot spectroscopy.
[1] C. Wolpert, C. Dicken, P. Atkinson, L. Wang, A. Rastelli, O. G. Schmidt, H. Giessen, and M. Lippitz, Nano Lett. 12, 453 (2012).