Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)
HL 95.15: Poster
Donnerstag, 19. März 2015, 14:00–20:00, Poster B
Ultrafast Dual Color Transient Absorption Spectroscopy with synchronized GHz-Oscillators — •Christian Dicken1, Alexander Neufeld1, Christian Wolpert2, and Markus Lippitz1 — 1Experimental Physics III, University of Bayreuth, Germany — 2Solid State Spectroscopy Group, Kyoto University, Japan
Nanooptics heads towards coherently coupled single emitters as ingredients in numerous applications. Knowledge of the coherent properties and optical control of the quantum state of the emitters are crucial points in designing such systems.
We demonstrated[1] recently that it is possible to detect, analyze and control a single semiconductor quantum dot in an optical far-field experiment, utilizing spectrally resolved transient absorption spectroscopy and coherent manipulation of the quantum dot state.
As a next step, we present an approach to increase the signal-to-noise ratio by an order of magnitude by switching to a fs-Ti:Sapphire oscillator with GHz repetition rate and acquisition of spectroscopic data with frame rates up to 126 kHz.
[1] C. Wolpert et al, Nano Lett., 2012, 12 (1), pp 453-457.