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Surface-Step-Terrace Tuned Second-Order Nonlinear Optical Coefficients of Epitaxial Ferroelectric BaTiO3 Films

Abstract

Ferroelectric films epitaxially grown on the vicinal substrates have been widely researched in recent decades for their unprecedented performance tuned by the surface-step-terrace (SST) induced strains of substrates. Here, the BaTiO3 films are epitaxially grown on miscut (001) SrTiO3 substrates with different miscut angles of 0°, 0.2°, 1°, and 2°, and the impacts of SST induced strains on second-order nonlinear optical coefficients are discussed by fitting the measured second harmonic generation (SHG) signals from the films. The results show that different miscut angles of substrates can bring about different SST strain states in BTO films, which make different contributions on second-order nonlinear optical coefficients. These results disclose that the second-order nonlinear optical coefficients can be effectively controlled by SST induced strains, which provides a new way to tune the optical properties of functional oxide thin films.

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Publication details

The article was received on 09 Jun 2018, accepted on 09 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC02819B
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Surface-Step-Terrace Tuned Second-Order Nonlinear Optical Coefficients of Epitaxial Ferroelectric BaTiO3 Films

    X. Zhong, Y. Zhang, Q. Guo, S. Zheng, G. Zhong, D. Zhang, C. Ren, C. Tan, Z. Lu, Z. Yi, Y. Tang, J. Wang and J. Yuan, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02819B

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