title: THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric.
abstract: Second Harmonic Generation induced by the electric field of a strong nearly single-cycle terahertz pulse with the peak amplitude of 300 kV/cm is studied in a classical inorganic ferroelectric thin film of (Ba0.8Sr0.2)TiO3. The dependences of the SHG intensity on the polarization of the incoming light is revealed and interpreted in terms of electric polarization induced in the plane of the film. As the THz pulse pumps the medium in the range of phononic excitations, the induced polarization is explained as a dynamical change of the ferrolectric order parameter. It is estimated that under action of the THz pulse the ferroelectric order parameter acquires an in-plane component up to 6% of the net polarization.
authors.affiliation: Moscow Technological University, MIREA, Vernadsky Ave. 78, 119454, Moscow, Russia. grishunin@mirea.ru.
authors.forename: Kirill A
authors.initials: KA
authors.lastname: Grishunin
authors.affiliation: Moscow Technological University, MIREA, Vernadsky Ave. 78, 119454, Moscow, Russia.
authors.forename: Nikita A
authors.initials: NA
authors.lastname: Ilyin
authors.affiliation: Moscow Technological University, MIREA, Vernadsky Ave. 78, 119454, Moscow, Russia.
authors.forename: Natalia E
authors.initials: NE
authors.lastname: Sherstyuk
authors.affiliation: Moscow Technological University, MIREA, Vernadsky Ave. 78, 119454, Moscow, Russia.
authors.forename: Elena D
authors.initials: ED
authors.lastname: Mishina
authors.affiliation: Moscow Technological University, MIREA, Vernadsky Ave. 78, 119454, Moscow, Russia.|Institute for Molecules and Materials, Radboud University Nijmegen, 6525, AJ, Nijmegen, The Netherlands.
authors.forename: Alexey
authors.initials: A
authors.lastname: Kimel
authors.affiliation: Southern Scientific Center of Russian Academy of Sciences, Chehova 41, Rostov-on-Don, 344006, Russia.
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Mukhortov
authors.affiliation: Joint Institute for High Temperatures of Russian Academy of Sciences (JIHT), Izhorskaya st. 13 Bd. 2, 125412, Moscow, Russia.
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Ovchinnikov
authors.affiliation: Joint Institute for High Temperatures of Russian Academy of Sciences (JIHT), Izhorskaya st. 13 Bd. 2, 125412, Moscow, Russia.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Chefonov
authors.affiliation: Joint Institute for High Temperatures of Russian Academy of Sciences (JIHT), Izhorskaya st. 13 Bd. 2, 125412, Moscow, Russia.
authors.forename: Mikhail B
authors.initials: MB
authors.lastname: Agranat