Optics of epitaxial strained strontium titanate films

Diverse effects of lattice strain on the optical properties in the near-infrared to vacuum ultraviolet spectral range are experimentally revealed in cube-on-cube-type epitaxial perovskite SrTiO3 films grown on compressive substrate. Compared to the reference crystal, the tetragonal antiferrodistorti...

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Bibliographic Details
Published in:Applied physics letters 2020-08, Vol.117 (8)
Main Authors: Tyunina, M., Nepomniashchaia, N., Vetokhina, V., Dejneka, A.
Format: Article
Language:English
Subjects:
Applied physics
Epitaxial growth
Ferroelectricity
Galling
Lattice strain
Near infrared radiation
Optical properties
Perovskites
Phonons
Strontium titanates
Substrates
Ultraviolet spectra
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Summary:Diverse effects of lattice strain on the optical properties in the near-infrared to vacuum ultraviolet spectral range are experimentally revealed in cube-on-cube-type epitaxial perovskite SrTiO3 films grown on compressive substrate. Compared to the reference crystal, the tetragonal antiferrodistortive film exhibits spectral blueshifts, which are consistent with the theoretically predicted bandgap widening. In addition to this strain-induced interband effect, the peculiar near-edge absorption and smearing of interband transitions are found. It is shown that Fröhlich-type electron–phonon coupling can be enhanced by strain and lead to this behavior. It is suggested that electron–phonon interactions can play an important role in optical properties of ferroelectric films and deserve further studies.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0021461