SKM 2023 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Focus: Domains and Domainwalls in (Multi)Ferroic II
KFM 4.10: Talk
Tuesday, March 28, 2023, 12:50–13:10, POT 51
Three-dimensional imaging of ferroelectric domains using digital holographic tomography — •Pavel Mokry1,2, Marek Mach1,2, Pavel Psota1, and Karel Zidek1 — 1Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czech Republic — 2Institute of Plasma Physics of the Czech Academy of Sciences, Prague, Czech Republic
The formation and evolution of domain patterns in ferroelectrics are fascinating physical phenomena, which determine to a large extent, the macroscopic properties of ferroelectric samples. Therefore, imaging of ferroelectric domains belongs to the essential characterization techniques of ferroelectric materials. This work demonstrates the three-dimensional (3D) imaging of ferroelectric domains using Digital Holographic Tomography (DHT). Our method is based on the construction of the Digital Holographic Microscope, which allows taking several images of the domain pattern projections from different directions. The 3D image of the ferroelectric domain pattern is then numerically reconstructed using our original method called Curvilinear Filtered Back-projection. Our experimental method has been demonstrated by imagining the domain structure in periodically poled lithium niobate single crystals. The developed method allows fast and accurate 3D observations of ferroelectric domain structures in the whole volume of the ferroelectric single crystals on the centimeter scale. The recent DHM and DHT systems, which allow high-resolution optical imaging and on-chip optical imaging of ferroelectric domain patterns, are demonstrated and discussed.