SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 39: Poster Session: Heterogeneous Catalysis and Surface Dynamics
O 39.2: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
SFG microscopy of ferroelectric domains in Barium Titanate — •Dorothee Mader1, Daniel Lourens2, Maarten Kwaaitaal2, Richarda Niemann1, Sören Wasserroth1, Sandy Gewinner1, Marco De Pas1, Wieland Schöllkopf1, Martin Wolf1, Andrei Kirilyuk2, Sebastian Maehrlein1, and Alexander Paarmann1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2Radboud Universiteit, Nijmegen, The Netherlands
Phonons exhibit a mostly unexplored leverage on ferroic order and its dynamics. Exploring the possibility of phonon-driven changes to the ferroelectric order provides an attractive route for potential applications of ferroelectric devices. Here, infrared-visible (IR-VIS) sumfrequency generation (SFG) microscopy with IR-sub-wavelength resolution [1] is employed combining resonant phonon excitation and ferroelectric domain imaging of barium titanate [BTO]. BTO is a non-centrosymmetric perovskite oxide with a strong ferroelectric polarization in its tetragonal phase at room temperature.Typically, BTO samples exhibit a multi-domain structure. Using the FHI Infrared (IR) free electron laser (FEL) in the range of 400-800 cm−1 different phonon modes of BTO are accessible. After characterization of the samples using linear optical techniques like polarization microscopy and infrared spectroscopy, the nonlinear optical properties of the ferroelectric domains are investigated using SFG-microscopy. By mapping phonon resonances in domains and domain walls, this approach may enable in-depth understanding of the underlying physics of domain formation. [1] R. Niemann et al., Appl. Phys. Lett. 120, 131102 (2022).