Strain-dependence of χ (2) in thin film barium strontium titanate

Natalie D. Foster, Bryce I. Edmondson, John G. Ekerdt, David Smith, Michael C. Downer

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Abstract

Optical second-harmonic generation (SHG) in reflection characterized variations in the second-order nonlinear optical susceptibility χ (2) of Ba 1-x Sr x TiO 3 (BSTO) alloy films grown epitaxially on SrTiO 3 (001) (STO) as Sr molar ratio x changed from 0 to 1 and thickness from 10 to 50 nm. X-ray diffraction showed that BSTO films with x 0.1 were highly crystalline and compressively strained with out-of-plane (in-plane) lattice constant 4.09 > c > 3.97 (3.903 < a < 3.907 Å, pinned to substrate) for 0 < x < 1. Spectroscopic ellipsometry showed that the BSTO dielectric function was nearly x-invariant in the range of fundamental (780 nm) and SH (390 nm) wavelengths. SHG intensity peaked at x ∼ 0.3 for a given film thickness, suggesting that composition control can optimize ferroelectric and electro-optic properties of BSTO films grown on STO buffer layers.

Original languageEnglish (US)
Article number025312
JournalAIP Advances
Volume9
Issue number2
DOIs
StatePublished - Feb 1 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Foster, N. D., Edmondson, B. I., Ekerdt, J. G., Smith, D., & Downer, M. C. (2019). Strain-dependence of χ (2) in thin film barium strontium titanate AIP Advances, 9(2), [025312]. https://doi.org/10.1063/1.5055731