Abstract
The ultrafast ferroelectric polarization dynamics excited by intense THz pulses (with an electric field up to 23 MV/cm) in a multidomain Ba0.8Sr0.2TiO3 thin film has been experimentally demonstrated using optical second harmonic generation (SHG) probe. The obtained nonlinear dependence of the SHG intensity on the electric field of the THz pulse can be explained in terms of Landau-Khalatnikov equation by a transient ferroelectric polarization reversal. The best agreement between the experimental and simulated data was obtained when taking into account the multidomain structure of the film and carrying out convolution of the simulated polarization dynamics and the optical probe pulse.
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