https://www.cambridge.org/core/journals/mrs-advances/article/polarization-switching-in-ferroelectric-thin-film-induced-by-a-singleperiod-terahertz-pulse/91CA5CE74306D2C39DC594B0BE31C92E
We report here an experimental study of ultrafast response of the dielectric polarization in (Ba0.8Sr0.2)TiO3 thin films to a strong electric field of a nearly single-cycle THz pulse. The phenomenon of Second Harmonic Generation (SHG) is used as a probe of the polarization in the terahertz pump-optical probe experiment. SHG loops for THz pulses of different amplitudes were obtained. The SHG response is modelled assuming that the ferroelectric material is split into 180-degree domains. It is shown that intuitive model based on forced harmonic oscillator does not fully describe to the observed ultrafast ferroelectric response.
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