University of Oulu

Dejneka, A., Chvostova, D., Pacherova, O., Kocourek, T., Jelinek, M., & Tyunina, M. (2018). Optical effects induced by epitaxial tension in lead titanate. Applied Physics Letters, 112(3), 31111.

Optical effects induced by epitaxial tension in lead titanate

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Author: Dejneka, A.1; Chvostova, D.1; Pacherova, O.1;
Organizations: 1Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
2Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P. O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: American Institute of Physics, 2018
Publish Date: 2019-05-13


Single-crystal-type epitaxial films of perovskite oxide ferroelectrics are attractive for integrated photonic applications because of the remarkable optical properties and effects in ferroelectrics. The properties of the films may be influenced by epitaxial strain arising from the film-substrate mismatch. Here, dramatic strain-induced changes of the absorption and refraction are experimentally detected by spectroscopic ellipsometry in epitaxial films of archetypical ferroelectric PbTiO₃. Comparison of the properties of a tensile-strained film with those of reference films and crystals reveals that epitaxial tension produces blueshifts of the primary above-bandgap absorption peaks by 1 eV and a decrease in the refractive index by 0.5 in the transparent spectral range. The obtained quadratic electrooptic and effective elastooptic coefficients exceed the bulk values by orders of magnitude. The experimental observations prove that epitaxy is a powerful tool for engineering unprecedented optical properties that may enable future photonics innovations.

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Series: Applied physics letters
ISSN: 0003-6951
ISSN-E: 0003-6951
ISSN-L: 0003-6951
Volume: 112
Issue: 3
Article number: 031111
DOI: 10.1063/1.5013640
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors acknowledge support from the Grant Agency of Czech Republic (Grant Nos. 15-13778S and 15-15123S) and Infotech Oulu of the University of Oulu.
Copyright information: © 2018 The Authors. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters 112:3 and may be found at