Recent analyses by polarization resolved second-harmonic (SH) microscopy have demonstrated that ferroelectric (FE) domain walls (DWs) can possess non-Ising wall characteristics and topological nature. These analyses rely on locally analyzing the properties, directionality, and magnitude of the second-order nonlinear tensor. However, when inspecting FE DWs with SH microscopy, a manifold of different effects may contribute to the observed signal difference between domains and DWs, i.e., far-field interference, Čerenkov-type phase-matching (CSHG), and changes in the aforementioned local nonlinear optical properties. They all might be present at the same time and, therefore, require careful interpretation and separation. In this work, we demonstrate how the particularly strong Čerenkov-type contrast can selectively be blocked using dark- and bright-field SH microscopy. Based on this approach, we show that other contrast mechanisms emerge that were previously overlayed by CSHG but can now be readily selected through the appropriate experimental geometry. Using the methods presented, we show that the strength of the CSHG contrast compared to the other mechanisms is approximately 22 times higher. This work lays the foundation for the in-depth analysis of FE DW topologies by SH microscopy.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:90797 |
| Date | 16 May 2024 |
| Creators | Hegarty, Peter A., Beccard, Henrik, Eng, Lukas M., Rüsing, Michael |
| 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 | 1089-7550, 244102, 10.1063/5.0094988, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/SFB 1415: Chemie der synthetischen zweidimensionalen Materialien/417590517/, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/TOP-ELEC/EN 434/41-1/, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/FOR 5044: Periodische niedrigdimensionale Defektstrukturen in polaren Oxiden/426703838/, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/Exzellenzcluster (ExStra)/390858490//EXC 2147: Komplexität und Topologie in Quantenmaterialien/CT.QMAT |
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