THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric.
THz Electric Field-Induced Second Harmonic Generation in Inorganic Ferroelectric.
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DOI：
10.1038/s41598-017-00704-9
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发表时间：
2017-04-06
影响因子：
4.6
通讯作者：
Agranat MB
中科院分区：
文献类型：
--
作者：
Grishunin KA;Ilyin NA;Sherstyuk NE;Mishina ED;Kimel A;Mukhortov VM;Ovchinnikov AV;Chefonov OV;Agranat MB
研究了峰值振幅为300 kV/cm的近单周期太赫兹脉冲电场在经典无机铁电薄膜（Ba0.8Sr0.2）TiO 3中产生的二次谐波。的入射光的偏振的二次谐波强度的依赖关系被揭示和解释在平面中的薄膜中诱导的电极化。由于太赫兹脉冲在声子激发范围内泵浦介质，因此激发极化被解释为铁电序参量的动态变化。据估计，在太赫兹脉冲的作用下，铁电序参量获得一个面内分量高达6%的净极化。
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.