Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Resonant Excitation of the Ferroelectric Soft Mode by a Narrow-Band THz Pulse

Kirill Brekhov
ORCID logo ,
Vladislav Bilyk
* ,
Andrey Ovchinnikov
ORCID logo ,
Oleg Chefonov
,
Vladimir Mukhortov
,
Elena Mishina
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Version 1 : Received: 10 May 2023 / Approved: 12 May 2023 / Online: 12 May 2023 (05:02:12 CEST)

A peer-reviewed article of this Preprint also exists.

Brekhov, K.; Bilyk, V.; Ovchinnikov, A.; Chefonov, O.; Mukhortov, V.; Mishina, E. Resonant Excitation of the Ferroelectric Soft Mode by a Narrow-Band THz Pulse. Nanomaterials 2023, 13, 1961. Brekhov, K.; Bilyk, V.; Ovchinnikov, A.; Chefonov, O.; Mukhortov, V.; Mishina, E. Resonant Excitation of the Ferroelectric Soft Mode by a Narrow-Band THz Pulse. Nanomaterials 2023, 13, 1961.

Abstract

This study investigates the impact of narrow-band terahertz pulses on the ferroelectric order parameter in Ba0.8Sr0.2TiO3 films on various substrates. The 375 nm thick BST film on an MgO (001) substrate exhibits enhanced THz-induced second harmonic generation when excited by THz pulses with a central frequency of 1.6 THz, due to the resonant excitation of the soft phonon mode. Conversely, the BST film on a Si (001) substrate shows no enhancement, due to its polycrystalline state. The 800 nm thick BST film on an MgO (111) substrate demonstrates maximum of second harmonic generation signal when excited by THz pulses at 1.8 THz, that is also very close to it`s soft mode frequency (1.9 THz). Notably, the frequency spectrum of the BST/MgO (111) film reveals peaks at both the fundamental and doubled frequencies, highlighting the quadratic dependence of SHG intensity on the THz pulse's electric field strength.

Keywords

THz excitation; ferroelectric; second harmonic generation

Subject

Physical Sciences, Optics and Photonics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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