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

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• 作者：A. V. Ovchinnikov ; O. V. Chefonov ; M. B. Agranat ; K. A. Grishunin…
• 刊名：JETP Letters
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：104
• 期：7
• 页码：441-448
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Particle and Nuclear Physics; Atomic, Molecular, Optical and Plasma Physics; Solid State Physics; Quantum Information Technology, Spintronics; Biological and Medical Physics, Biophysics;
• 出版者：Pleiades Publishing
• ISSN：1090-6487
• 卷排序：104

文摘

Optical second harmonic generation at the photon energy of 2ℏω = 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.