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

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strontium
barium
harmonic generations
thin films
electro-optics
ellipsometry
film thickness
buffers
magnetic permeability
diffraction
wavelengths
x rays

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

Strain-dependence of χ (2) in thin film barium strontium titanate . / Foster, Natalie D.; Edmondson, Bryce I.; Ekerdt, John G.; Smith, David; Downer, Michael C.

In: AIP Advances, Vol. 9, No. 2, 025312, 01.02.2019.

Research output: Contribution to journalArticle

Foster, ND, Edmondson, BI, Ekerdt, JG, Smith, D & Downer, MC 2019, ' Strain-dependence of χ (2) in thin film barium strontium titanate ', AIP Advances, vol. 9, no. 2, 025312. https://doi.org/10.1063/1.5055731
Foster, Natalie D. ; Edmondson, Bryce I. ; Ekerdt, John G. ; Smith, David ; Downer, Michael C. / Strain-dependence of χ (2) in thin film barium strontium titanate In: AIP Advances. 2019 ; Vol. 9, No. 2.
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