Strain-induced second-harmonic generation in pseudocubic Ba0.48Sr0.52TiO3 thin films

U. C. Oh; Jing Ma; G. K.L. Wong; J. B. Ketterson; Jung Ho Je

doi:10.1063/1.126064

Strain-induced second-harmonic generation in pseudocubic Ba_0.48Sr_0.52TiO₃ thin films

U. C. Oh^*, Jing Ma, G. K.L. Wong, J. B. Ketterson, Jung Ho Je

^*Corresponding author for this work

MRC - Materials Research Center

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

5 Scopus citations

Abstract

We report the observation of a strong second-order nonlinear optical response from epitaxial Ba_0.48Sr_0.52TiO₃ thin films grown on MgO(001) by magnetron sputtering. The result is unexpected since the crystal structure of Ba_0.48Sr_0.52TiO₃ is centrosymmetric under ambient conditions. A second-order nonlinear susceptibility d₃₃ as large as 11 pm/V at a fundamental wavelength of 1.064 μm is observed in a 300 Å thick film. By studying a series of films with different strains, induced by a film-substrate lattice mismatch, we conclude that the resulting tetragonal distortion, presumably accompanied by a loss of inversion symmetry, is responsible for the second-harmonic generation.

Original language	English (US)
Pages (from-to)	1461-1463
Number of pages	3
Journal	Applied Physics Letters
Volume	76
Issue number	11
DOIs	https://doi.org/10.1063/1.126064
State	Published - Mar 13 2000

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Strain-induced second-harmonic generation in pseudocubic Ba0.48Sr0.52TiO3 thin films",

abstract = "We report the observation of a strong second-order nonlinear optical response from epitaxial Ba0.48Sr0.52TiO3 thin films grown on MgO(001) by magnetron sputtering. The result is unexpected since the crystal structure of Ba0.48Sr0.52TiO3 is centrosymmetric under ambient conditions. A second-order nonlinear susceptibility d33 as large as 11 pm/V at a fundamental wavelength of 1.064 μm is observed in a 300 {\AA} thick film. By studying a series of films with different strains, induced by a film-substrate lattice mismatch, we conclude that the resulting tetragonal distortion, presumably accompanied by a loss of inversion symmetry, is responsible for the second-harmonic generation.",

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T1 - Strain-induced second-harmonic generation in pseudocubic Ba0.48Sr0.52TiO3 thin films

AU - Oh, U. C.

AU - Ma, Jing

AU - Wong, G. K.L.

AU - Ketterson, J. B.

AU - Je, Jung Ho

PY - 2000/3/13

Y1 - 2000/3/13

N2 - We report the observation of a strong second-order nonlinear optical response from epitaxial Ba0.48Sr0.52TiO3 thin films grown on MgO(001) by magnetron sputtering. The result is unexpected since the crystal structure of Ba0.48Sr0.52TiO3 is centrosymmetric under ambient conditions. A second-order nonlinear susceptibility d33 as large as 11 pm/V at a fundamental wavelength of 1.064 μm is observed in a 300 Å thick film. By studying a series of films with different strains, induced by a film-substrate lattice mismatch, we conclude that the resulting tetragonal distortion, presumably accompanied by a loss of inversion symmetry, is responsible for the second-harmonic generation.

AB - We report the observation of a strong second-order nonlinear optical response from epitaxial Ba0.48Sr0.52TiO3 thin films grown on MgO(001) by magnetron sputtering. The result is unexpected since the crystal structure of Ba0.48Sr0.52TiO3 is centrosymmetric under ambient conditions. A second-order nonlinear susceptibility d33 as large as 11 pm/V at a fundamental wavelength of 1.064 μm is observed in a 300 Å thick film. By studying a series of films with different strains, induced by a film-substrate lattice mismatch, we conclude that the resulting tetragonal distortion, presumably accompanied by a loss of inversion symmetry, is responsible for the second-harmonic generation.

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Strain-induced second-harmonic generation in pseudocubic Ba_0.48Sr_0.52TiO₃ thin films

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