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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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 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 languageEnglish (US)
Pages (from-to)1461-1463
Number of pages3
JournalApplied Physics Letters
Volume76
Issue number11
DOIs
StatePublished - Mar 13 2000

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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