Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Poster Monday: Ultrafast Processes 1
O 16.1: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Probing photo-induced, ultra-fast dynamics by time-resolved spectroscopic ellipsometry — •Felix-Florian Delatowski1,3, Krishna Khakurel1, Jörg Rappich2, Shirly Espinoza1, Mateusz Rebarz1, Martin Zahradnik1, and Jakob Andreasson1 — 1ELI Beamlines, Institute of Physics, Czech Academy of Sciences, Czech Republic — 2Institute Silicon Photovoltaics, Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — 3Semiconductor Physics Group, Felix Bloch Institute for Solid State Physics, Universität Leipzig, Germany
Photo-induced phenomena, such as charge carrier and structural dynamics, charge transfer and relaxation processes on sub-picosecond time scales are of great interest for a profound understanding of light-matter interaction. Time-resolved spectroscopic ellipsometry is a promising surface sensitive tool to investigate these phenomena. In this work, we explore the potential of this measurement technique exemplary on germanium and gold and present preliminary experimental results.
In addition to the experimental observations, we also present an approach to predict ellipsometry spectra through ab-initio DFT calculations using the program SIESTA. In order to extend this approach, some preliminary measurements of organic molecules (Pyrimidine) have been performed. We discuss the benefits that the synergy of ab-initio based spectrum predictions and experiments bring in the interpretation of the dynamics in the sample.