SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.18: Poster
Dienstag, 28. März 2023, 17:00–19:00, P3
Nonlinear optical interactions in confined nanostructures — •Zeeshan Hussain Amber1, Kai Jürgen Spychala2, Boris Koppitz1, Lukas M Eng1,3, and Michael Rüsing1 — 1Institut für Angewandte Physik, TU Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — 2Department of Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 3ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden, 01062 Dresden, Germany
Nonlinear optical (NLO) micro-spectroscopy is a very power tool for both investigating the material properties and noninvasively visualizing domains and domain walls in ferroelectric materials [1]. Thin film materials are usually supported on substrates leading to interference and reflection related phenomena during -spectroscopy, which make interpretation of experimental results particularly challenging. Here, we report on Second Harmonic (SH) and Third Harmonic (TH) generation experiments on wedge-shaped samples cut out from 5%Mg-doped congruent Lithium niobate single crystals, and compare these findings with numerical [2] and semi-analytical simulations. We find that thin-film interference, reflection and phase matching strongly affect the signal strength in SH/TH generation. The excellent agreement between the simulated and experimental data shows that rigorous theoretical analysis can help identifying genuine material properties through systematically varied sample and setup parameters during NLO analysis.
[1] M. Ruesing et al., J. Appl. Phys. 126,114105 (2019). [2] Z.H. Amber et al., J. Appl. Phys. 130,133102 (2021).