Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Optical properties & Photonic crystals
HL 52.7: Vortrag
Freitag, 16. März 2018, 11:00–11:15, EW 201
Time-resolved spectroscopic ellipsometry with sub-ps resolution — •Steffen Richter1, Oliver Herrfurth1, Shirly Espinoza2, Mateusz Rȩbarz2, Miroslav Kloz2, Jakob Andreasson2,3, Marius Grundmann1, and Rüdiger Schmidt-Grund1 — 1Universität Leipzig, Felix-Bloch-Instiut für Festkörperphysik, Linnéstr. 5, 04103 Leipzig, Germany — 2ELI beamlines, Za Radnicí 835, Dolní Břežany, Czech Republic — 3Chalmers tekniska högskola, Institutionen för fysik, Kemigården 1, 41296 Göteborg, Sweden
Knowledge of the temporal evolution of the complex optical properties in response to optical excitation is crucial for understanding of fundamental physical processes inherent in semiconductors. We demonstrate time-resolved ellipsometry in a pump-probe scheme employing continuum white-light probe and UV pump pulses. The ellipsometric approach allows to obtain the dynamics of the dielectric function in a broad spectral range with an estimated time resolution of 170fs. We will stress on essential experimental requirements and show data obtained from ZnO samples. We will also give an outlook on the pump-probe VUV ellipsometer being built up at ELI beamlines.