SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.41: Poster
Dienstag, 28. März 2023, 17:00–19:00, P3
Multiphoton imaging of ferroelectric domain structures by means of tunable, high energy fs-pulses — •Fiete Breer1, Felix Kodde1, Laura Vittadello1, Jan Klenen1, Michael Ruesing2, and Mirco Imlau1 — 1Inst. Physics, Barbarastr. 7, Osnabrück Univ. — 2Inst. Applied Physics, Nöthnitzer Str. 61, Techn. Univ. Dresden
Multiphoton imaging is a powerful tool for the analysis of polar oxide crystals and has been recently used to reveal previously not expected topologies present in ferroelectric domain walls [https://arxiv.org/abs/2207.01307]. In addition to non-linear optical effects, the system-specific parameters of the optical measuring arrangement in the microscope also determines the detected measurement signals. This includes, for example, the collimation of the infrared excitation light, the direction between excitation and detection, but also the apertures in the beam path of the confocal beam geometry and, therefore, require careful consideration when interpreting experimental results. In this work a Tunable hIGh EneRgy (TIGER) multiphoton microscope [Vittadello et al., Nanomaterials 11, 3193 (2021)] pumped by high energy fs-laser pulses from an optical parametric amplifier allowing for widefield SHG is used to study ferroelectric domain structures. The results are comparatively evaluated for different measurement setups, discussed and possible consequences for the interpretation of the origin of the SHG signal from widefield and scanning modes are presented. Funded by the DFG (project IM 37/12-1, FOR 5044 and RU 2474/1-1).