Elasto-optic behaviour in epitaxial films of perovskite oxide ferroelectrics
Dejneka, Alexandr; Tyunina, Marina (2018-06-27)
Alexandr Dejneka & Marina Tyunina (2018) Elasto-optic behaviour in epitaxial films of perovskite oxide ferroelectrics, Advances in Applied Ceramics, 117:1, 62-65, DOI: 10.1080/17436753.2017.1366734
© Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Advances in Applied Ceramics 117:1, available online: http://www.tandfonline.com/10.1080/17436753.2017.1366734.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019051315290
Tiivistelmä
Abstract
Large variations of refractive index in the visible spectral range are obtained in epitaxial perovskite oxide ferroelectric films experiencing lattice strain. The strain is imposed by substrates, on top of which the films are grown. The optical constants are determined using the spectroscopic ellipsometry. As a reference and for comparison, also prototype single crystals are inspected. The variations in refraction are related to the lattice strain in the films. Elasto-optic coefficient is formally estimated using the out-of-plane lattice elongation or shrinkage in the films compared to bulk. The obtained elasto-optic coefficients exceed significantly those previously reported for ferroelectric materials.
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