SKM 2021 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: Instrumentation and Methods
KFM 9.1: Vortrag
Mittwoch, 29. September 2021, 12:00–12:15, H1
Broadband Coherent Anti-Stokes Raman Scattering (B-CARS) on Solid State Systems — •Franz Hempel1, Sven Reitzig1, Michael Rüsing1, and Lukas M. Eng1, 2 — 1Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2ct.qmat Dresden-Würzburg Cluster of Excellence*EXC 2147, TU Dresden, 01062 Dresden, Germany
Broadband coherent anti-Stokes Raman scattering (B-CARS) combines the vibrational sensitivity of spontaneous Raman scattering (SR) with the gigantic signal amplification of coherent scattering techniques. B-CARS sees widespread applications in the biomedical fields for chemically-sensitive imaging, but has rarely been adapted to solid-state systems. In this work, we apply polarization-sensitive B-CARS to ferroelectric lithium niobate, and systematically investigate how the CARS signal depends on selection rules, power dependence and phase matching. In contrast to SR, B-CARS spectra are distorted in their spectral shape and position due to signal mixing with the non-resonant background (NRB). Here, we successfully apply Kramers-Kronig transformations, that originally were developed for biological samples but have been adapted here to crystalline-sample spectra. As a result, SR and B-CARS spectra become directly comparable, hence providing a brilliant basis for future inspections of nanoscale objects such as domain walls and defects in ferroelectrics.