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Piezoelectric modulation of nonlinear optical response in BaTiO3 thin film

Kormondy, Kristy J., Cho, Yujin, Posadas, Agham B., Zheng, Lu, Lai, Keji, Wang, Qingxiao, Kim, Moon J., He, Qian, Borisevich, Albina Y., Downer, Michael C. and Demkov, Alexander A. 2018. Piezoelectric modulation of nonlinear optical response in BaTiO3 thin film. Applied Physics Letters 113 (13) , 132902. 10.1063/1.5045460

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Abstract

We study the nonlinear optical response in a strained thin film ferroelectric oxide BaTiO3 using piezoelectric Pb(Mg1/3Nb2/3)O3-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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: AIP Publishing
ISSN: 0003-6951
Date of First Compliant Deposit: 22 October 2018
Date of Acceptance: 24 August 2018
Last Modified: 23 Jan 2020 03:30
URI: http://orca-mwe.cf.ac.uk/id/eprint/116091

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