Nonlinear optical diagnostics of perovskite thin films of lead zirconate titanate Текст научной статьи по специальности «Медицинские технологии»

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Nonlinear optical diagnostics of perovskite thin films of lead zirconate titanate

I. Pronin1, A. Elshin2, E. Mishina2, O. Sergeeva3, E. Kaptelov1, S. Senkevich4, D. Kiselev5 1Ioffe Institute, Physics of Dielectrics and Semiconductors, Saint-Petersburg, Russian Federation 2MIREA - Russian Tecnological University, Department of Nanoelectronics, Moscow, Russian Federation

3Tver State University, Deparment of CondencedMatter Physics, Tver, Russian Federation 4Ioffe Institute, Department of Physics of Dielectrics and Semiconductors, Saint-Petersburg, Russian Federation

5National University of Science and Technology, Department of Materials Science, Semiconductors and Dielectrics, Moscow, Russian Federation

Using nonlinear optical microscopy(femtosecond laser, Avesta-Project, X = 800 nm), atomic force microscopy (Nterga, NT MDT), and dynamic response to modulated laser irradiation (laser module CLM, X = 800 nm) we studied the microstructure, piezoelectric and pyroelectric responses of the perovskite thin films of Pb(Zr,Ti)O3 solid solutions deposited by radio-frequency magnetron sputtering at different distances (d = 30-70 mm) from the target to the substrate. Changing the distance allows ones to finely (within 2-3%) vary the composition of the solid solution (elemental ratio Zr/Ti) and optimize the electromechanical parameters of thin films [1].

It was found that the signal of the second optical harmonic (SHG) varies greatly: at large distances (d = 60-70 mm), the average signal was significantly lower than at the others. In individual perovskite islands, an inhomogeneous distribution of the SHG signal was detected, including signal amplification at the perovskite/pyrochlore boundary, which may be associated with relaxation of mechanical stresses (picture 1). The paper discusses the relationship between the SHG signal, the microstructure, and the polar properties of thin films.

Fig. 1. Nonlinear optical images of two spherulitic perovskite islands for different directions of polarization of the

laser radiation.

References

[1] Pronin VP., Dolgintsev D.M., Osipov V.V., Pronin I.P., Senkevich S.V. and Kaptelov E.Yu. IOP Conf. Series: Materials Science and Engineering, 387, 012063 (2018).