THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric

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(0.8)Sr(0.2))TiO(3). The dependences of the SHG intensity on the polarization of the incomin...

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Detalles Bibliográficos
Autores principales: Grishunin, Kirill A., Ilyin, Nikita A., Sherstyuk, Natalia E., Mishina, Elena D., Kimel, Alexey, Mukhortov, Vladimir M., Ovchinnikov, Andrey V., Chefonov, Oleg V., Agranat, Mikhail B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5429639/
https://www.ncbi.nlm.nih.gov/pubmed/28386081
http://dx.doi.org/10.1038/s41598-017-00704-9
Descripción
Sumario: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(0.8)Sr(0.2))TiO(3). 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.

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