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Near-field terahertz imaging of ferroelectric domains in barium titanate
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SYSNO ASEP 0354486 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Near-field terahertz imaging of ferroelectric domains in barium titanate Author(s) Berta, Milan (FZU-D) ORCID
Kadlec, Filip (FZU-D) RID, ORCID, SAISource Title Phase Transitions. - : Taylor & Francis - ISSN 0141-1594
Roč. 83, 10-11 (2010), 985-993Number of pages 9 s. Language eng - English Country GB - United Kingdom Keywords singular value decomposition ; domain structure imaging ; near-field terahertz microscopy ; subwavelength resolution Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000284539500026 DOI 10.1080/01411594.2010.509611 Annotation We report on results of a near-field imaging experiment with broadband terahertz pulses applied to a BaTiO3 multidomain single crystal. Data with a spatial resolution below 15 mm were collected by scanning time-domain terahertz imaging setup.We performed the scanning by an asymmetric skewed sapphire probe metallised from two sides ended with a 60 mm  140 mm facet. The imaging scans were performed with various angles of the polarisation of the probing field with respect to the direction of the domain walls in order to identify the orientations with optimal sensitivity. The raw experimental data were prewhitened and processed by the singular value decomposition. In this way, independent components belonging to experimental features (polarisation, noise and external perturbations) were found. The spatial resolution of the sensing probe was found significantly higher than that allowed by the outer dimensions of the probe end facet. This result was also confirmed by field simulations. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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