期刊
APPLIED PHYSICS LETTERS
卷 113, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5045460
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资金
- Air Force Office of Scientific Research [FA9550-12-10494, FA9550-18-1-0053]
- Robert Welch Foundation [F-1038]
- National Science Foundation [DMR-1707372]
- Louis Beecherl, Jr. endowment funds
We study the nonlinear optical response in a strained thin film ferroelectric oxide BaTiO3 using piezoelectric Pb(Mg1/3Nb2/3)O-3-PbTiO3 (001) as a variable strain substrate and La-doped SrTiO3 as a conductive buffer layer. The rotation-anisotropic second harmonic intensity profile shows hysteretic modulation corresponding to the strain variation from the inverse piezoelectric response of the substrate. An enhancement of 15% is observed at 1.2 kV/cm, while a control sample shows negligible change as a function of piezovoltage. Reflection high-energy electron diffraction, x-ray photoelectron spectroscopy, and high-resolution scanning transmission electron microscopy reveal the epitaxial interface. X-ray diffraction and piezoresponse force microscopy confirm tetragonal distortion and ferroelectricity of the BaTiO3 overlayer. Our results suggest a promising route to enhance the performance of nonlinear optical oxides for the development of future nano-opto-mechanical devices. Published by AIP Publishing.
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