Mishina E. D.1, Bilyk V. R.2, Sherstyuk N. E.1, Mukhortov V. M.3, Sharanov K. P.1, Agranat M.B.4, Ovchinnikov A. V.4, Sigov A. S.1
1MIREA - Russian Technological University, Moscow, Russia
2Radboud University, Nijmegen, The Netherlands
3Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
4Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
Email: sharanov@mirea.ru
The results of an experimental study by the method of terahertz pumping - nonlinear optical sensing of the picosecond dynamics of ferroelectric polarization induced by the action of a terahertz pulse in a ferroelectric film Bi4Ti3O12 on a silicon substrate in a wide range of the electric field strength of a THz pulse are presented. Numerical modeling based on the Landau-Khalatnikov equation of the dependences of the intensity of the second optical harmonic on the electric field shows the presence of a threshold THz field with an amplitude of Eth=4.5 MV/cm. It is shown that for small fields E<Eth, the polarization fluctuates within a certain minimum of the two-minimum potential, although in time the second harmonic signal follows the terahertz pulse. At E>Eth, polarization is switched and the time dependence of the intensity of the second harmonic becomes more complicated. Based on a comparison of theoretical and experimental data, the conditions for switching polarization by a strong electric field of a picosecond HZ pulse are analyzed. Keywords: ultrafast dynamics, polarization switching, terahertz radiation, ferroelectric films, bismuth titanate, second harmonic generation.
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