Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport

HL 30.16: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Theory of simultaneous time- and frequency-gated fluorescence and Raman spectroscopy in quantum dots — •Anke Zimmermann, Marten Richter, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstrasse 36, 10632 Berlin, Germany

Time-dependent light scattering and fluorescence of quantum dots are in the focus of current experimental and theoretical research. In particular the combination of time- and frequency-resolved fluorescence allows to inspect dephasing and relaxation mechanisms specifically for single quantum dot spectroscopy. Here, we study the interaction of a laser pulse with the dominant excitonic transition in a quantum dot coupled to phonons.

To determine simultaneously frequency and time-resolved emission properties, a spectral filter is combined with temporal gated detection.

In this way, it is possible to investigate the time and frequency gated fluorescence and the Raman signal including the interaction of electrons and phonons. The resulting equations and numerical evaluations are applied to different kinds of excitation conditions and filters.