Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Ultra-Fast Phenomena

HL 13.5: Talk

Tuesday, September 6, 2022, 10:30–10:45, H33

Strategies for Automating Femtosecond Time-Resolved Ellipsometry Data Analysis — •Noah Stiehm¹, Yixuan Zhang², Erich Runge³, Stefan Krischok¹, Hongbin Zhang², and Rüdiger Schmidt-Grund¹ — ¹Technische Universität Ilmenau, Fachgebiet Technische Physik I, Weimarer Straße 32, 98693 Ilmenau, Germany — ²Technische Universität Darmstadt, Research Group Theory of Magnetic Materials, Otto-Berndt-Straße 3, 64287 Darmstadt — ³Technische Universität Ilmenau, Fachgebiet Theoretische Physik I, Weimarer Straße 32, 98693 Ilmenau, Germany

With the recently developed experimental method of femtosecond time-resolved spectroscopic ellipsometry [1], it is possible to obtain the transient dielectric function of a sample after excitation in a pump-probe scheme. However, modeling the experimental data manually with established ellipsometry modeling workflows is cumbersome and significantly reduces the throughput of the experiment. Here we present strategies I) to formalize the experience and physical intuition usually entering modeling strategies, II) to reduce computational costs by application of dimensionality reduction techniques, especially in the additionally required ab-initio theory calculations, and III) to improve stability, to enable an automated modeling pipeline with minimal human intervention.

[1] S. Richter et al., Rev. Sci. Instrum. 92, 033104 (2021).