University of Oulu

M. Tyunina, N. Nepomniashchaia, V. Vetokhina, and A. Dejneka, "Superior elasto-optic tetragonal SrTiO3 films", APL Materials 9, 121108 (2021)

Superior elasto-optic tetragonal SrTiO3 films

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Author: Tyunina, M.1,2; Nepomniashchaia, N.2; Vetokhina, V.2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.2 MB)
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Language: English
Published: American Institute of Physics, 2021
Publish Date: 2022-02-16


Cutting-edge acousto-optic devices require optically transparent thin films, which possess a high index of refraction and large elasto-optic coefficients. For the wide near-infrared to ultraviolet spectral region, the mainstream technology employs lithium niobate crystals, which interferes with the vital demands of global sustainability. Here, we demonstrate unprecedented elasto-optic properties in thin films of sustainable and environmentally friendly strontium titanate [SrTiO3(STO)]. Compared to cubic STO, a nearly twofold increase in elasto-optic coefficients is achieved in epitaxial tetragonal STO films, which concurrently exhibit excellent transparency and a high index of refraction at wavelengths from 400 to 1700 nm. The room-temperature non-polar state is evidenced by the thermo-optical behavior of the films. The obtained enhancement is related to the tetragonal antiferrodistortive phase of STO. It is suggested that such films can form a platform for future sustainable acousto-optic materials.

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Series: APL materials
ISSN: 2166-532X
ISSN-E: 2166-532X
ISSN-L: 2166-532X
Volume: 9
Issue: 12
Article number: 121108
DOI: 10.1063/5.0075614
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors acknowledge support from the Czech Science Foundation (Grant No. 19-09671S) and the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21—CZ.02.1.01/0.0/0.0/16_019/0000760).
Copyright information: © 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (