Abstract
Very large lattice strain and strain-induced polarization are achieved in KNbO3 using epitaxial growth of a thin KNbO3 film onto a (001)-oriented SrTiO3 single-crystal substrate. We demonstrate experimentally that epitaxy produces dramatic changes of interband transitions in the film compared to those of a reference KNbO3 crystal: the energies of transitions change, some transitions are substantially suppressed and new ones appear in the film. A comparison of the experimental observations with theoretical calculations points to yet unexplored phenomena. Our results indicate that optical refraction and electro-optical coefficients of ferroelectric films can be controlled by epitaxial growth, which is of importance for emerging photonic and optoelectronic applications.
Highlights
Potassium niobate KNbO3 (KNO) belongs to a family of perovskite-structure oxide ferroelectrics
That optical refraction and electro-optical coefficients of ferroelectric films can be controlled by epitaxial growth, which is of importance for emerging photonic and optoelectronic applications
Large lattice strain is achieved in epitaxial cube-on-cube-type perovskite tetragonal KNO film on a (001) SrTiO3 single-crystal substrate as evidenced by high-resolution transmission electron microscopy (HRTEM) analysis
Summary
M Tyunina, L D Yao, D Chvostova, T Kocourek, M Jelinek, A Dejneka and S van Dijken. Very large lattice strain and strain-induced polarization are achieved in KNbO3 using epitaxial growth of a thin KNbO3 film onto a (001)-oriented SrTiO3 single-crystal substrate. Experimentally that epitaxy produces dramatic changes of interband transitions in the film compared. A comparison of the experimental the work, journal citation observations with theoretical calculations points to yet unexplored phenomena. That optical refraction and electro-optical coefficients of ferroelectric films can be controlled by epitaxial growth, which is of importance for emerging photonic and optoelectronic applications
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