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

doi:10.1063/1.5055731

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

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

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 language	English (US)
Article number	025312
Journal	AIP Advances
Volume	9
Issue number	2
DOIs	https://doi.org/10.1063/1.5055731
State	Published - Feb 1 2019

ASJC Scopus subject areas

General Physics and Astronomy

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title = " Strain-dependence of χ (2) in thin film barium strontium titanate ",

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 {\AA}, 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.",

author = "Foster, {Natalie D.} and Edmondson, {Bryce I.} and Ekerdt, {John G.} and David Smith and Downer, {Michael C.}",

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T1 - Strain-dependence of χ (2) in thin film barium strontium titanate

AU - Foster, Natalie D.

AU - Edmondson, Bryce I.

AU - Ekerdt, John G.

AU - Smith, David

AU - Downer, Michael C.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - 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.

AB - 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.

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

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