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 ORCID: https://orcid.org/0000-0003-4891-3581, 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:	04 May 2023 22:21
URI:	https://orca.cardiff.ac.uk/id/eprint/116091

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