Optical second harmonic generation induced by picosecond terahertz pulses in centrosymmetric antiferromagnet NiO

被引：15
作者：
Ovchinnikov, A. V. [1 ]
Chefonov, O. V. [1 ]
Agranat, M. B. [1 ]
Grishunin, K. A. [2 ]
Il'in, N. A. [2 ]
Pisarev, R. V. [3 ]
Kimel, A. V. [2 ,4 ]
Kalashnikova, A. M. [3 ,5 ]
机构：
[1] Russian Acad Sci, Joint Inst High Temp, Moscow 125412, Russia
[2] Moscow Technol Univ MIREA, Moscow 119454, Russia
[3] Ioffe Inst, St Petersburg 194021, Russia
[4] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525AJ Nijmegen, Netherlands
[5] St Petersburg State Univ, St Petersburg 199034, Russia
来源：
JETP LETTERS | 2016年 / 104卷 / 07期
基金：
俄罗斯科学基金会; 俄罗斯基础研究基金会;
关键词：
LASER; DYNAMICS; DSTMS;
D O I：
10.1134/S0021364016190085
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Optical second harmonic generation at the photon energy of 2a"omega = 2eV in the model centrosymmetric antiferromagnet NiO irradiated with picosecond terahertz pulses (0.4-2.5 THz) at room temperature is detected. The analysis of experimental results shows that induced optical second harmonic generation at the moment of the impact of a terahertz pulse arises through the electric dipole mechanism of the interaction of the electric field of a pump pulse with the electron subsystem of NiO. Temporal changes in optical second harmonic generation during 7 ps after the action of the pulse are also of an electric dipole origin and are determined by the effects of propagation of the terahertz pulse in a NiO platelet. Coherent oscillations of spins at the antiferromagnetic resonance frequency induced by the magnetic component of the terahertz pulse induce a relatively weak modulation of magnetic dipole optical second harmonic generation.
引用
收藏
页码：441 / 448
页数：8
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