Spontaneous Raman spectroscopy (SR) is a versatile method for analysis and visualization of ferroelectric crystal structures, including domain walls. Nevertheless, the necessary acquisition time makes SR impractical for in situ analysis and large scale imaging. In this work, we introduce broadband coherent anti-Stokes Raman spectroscopy (B-CARS) as a high-speed alternative to conventional Raman techniques and demonstrate its benefits for ferroelectric domain wall analysis. Using the example of poled lithium niobate, we compare the spectral output of both techniques in terms of domain wall signatures and imaging capabilities. We extract the Raman-like resonant part of the coherent anti-Stokes signal via a Kramers–Kronigbased phase retrieval algorithm and compare the raw and phase-retrieved signals to SR characteristics. Finally, we propose a mechanism for the
observed domain wall signal strength that resembles a Cerenkov-like behavior, in close analogy to domain wall signatures obtained by secondharmonic generation imaging.We, thus, lay here the foundations for future investigations on other poled ferroelectric crystals using B-CARS.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:91990 |
| Date | 11 June 2024 |
| Creators | Reitzig, Sven, Hempel, Franz, Ratzenberger, Julius, Hegarty, Peter A., Amber, Zeeshan H., Buschbeck, Robin, R€using, Michael, Eng, Lukas M. |
| Publisher | American Institute of Physics |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1077-3118, 162901, 10.1063/5.0086029, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/SFB 1415: Chemie der synthetischen zweidimensionalen Materialien/417590517/ |
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