Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia.
J Chem Phys. 2017 Aug 28;147(8):084507. doi: 10.1063/1.5000374.
The terahertz induced optical birefringence in liquids with polar (acetone, chloroform) and nonpolar (benzene, carbon tetrachloride) molecules has been investigated. Fast and slow responses were extracted from the experimental data and compared with previous studies of the femtosecond optical Kerr effect. Terahertz Kerr constants were found and compared with known DC and optical constants. Analysis of the results obtained showed that, in contrast to the optical excitation, the interaction of a permanent dipole moment of molecules with a THz field makes a significant contribution to the transient birefringence and Kerr constants. This conclusion fully agrees with the direct comparison of the femtosecond optical and THz Kerr effects reported by Sajadi et al. [Nat. Commun. 8, 14963 (2017)].
我们研究了具有极性（丙酮、氯仿）和非极性（苯、四氯化碳）分子的液体中的太赫兹诱导光学双折射。从实验数据中提取了快响应和慢响应，并与飞秒光克尔效应的先前研究进行了比较。发现了太赫兹克尔常数，并与已知的直流和光学常数进行了比较。对获得的结果进行的分析表明，与光激发相反，分子的永久偶极矩与太赫兹场的相互作用对瞬态双折射和克尔常数有显著贡献。这一结论与 Sajadi 等人报道的飞秒光克尔和太赫兹克尔效应的直接比较完全一致。[Nat. Commun. 8, 14963 (2017)]。
