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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 (Ba_0.8Sr_0.2)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.

SUBMITTER: Grishunin KA

PROVIDER: S-EPMC5429639 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric.

Grishunin Kirill A KA Ilyin Nikita A NA Sherstyuk Natalia E NE Mishina Elena D ED Kimel Alexey A Mukhortov Vladimir M VM Ovchinnikov Andrey V AV Chefonov Oleg V OV Agranat Mikhail B MB

Scientific reports 20170406 1

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 excitation ...[more]

PMID: 28386081

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