Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 24: Poster Session II
HL 24.5: Poster
Dienstag, 13. März 2018, 18:30–20:30, Poster F
Speeding up a single quantum dot pump-probe experiment — •Gerhard Johannes Schäfer1, Armando Rastelli2,3, and Markus Lippitz1 — 1Experimentalphysik III, Universität Bayreuth, Bayreuth, Germany — 2Institute for Integrative Nanosciences, IWF Dresden, Dresden, Germany — 3Institute 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 these measurements. Due to the short lifetime of an excited quantum dot of around 300 ps we plan to increase the measurement speed. We increase the repetition rate of our laser system by a factor of 13 now the time delay between two laser pulses in the new setup is only 1 ns.
We are interested in the characterization of a single quantum dot two-level system and its interaction with the environment through transient absorption spectroscopy. We plan to add plasmonic structures for 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).