Elasto-optic behaviour in epitaxial films of perovskite oxide ferroelectrics

0493922 - FZÚ 2019 RIV GB eng J - Journal Article
Dejneka, Alexandr - Tyunina, Marina
Elasto-optic behaviour in epitaxial films of perovskite oxide ferroelectrics.
Advances in Applied Ceramics. Roč. 117, č. 1 (2018), s. 62-65. ISSN 1743-6753. E-ISSN 1743-6761
R&D Projects: GA ČR GA15-13778S; GA ČR GA15-15123S
Institutional support: RVO:68378271
Keywords : epitaxial films * elasto-optic * perovskites * refractive index
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.429, year: 2018

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.
Permanent Link: http://hdl.handle.net/11104/0287190