Ultrafast excitation of coherent phonons in iron garnet
Ultrafast excitation of coherent phonons in iron garnet
复制标题
铁石榴石中相干声子的超快激发
DOI：
10.1088/1361-648x/ab1665
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and T. Satoh
中科院分区：
文献类型：
--
作者：
P. Khan;M. Kanamaru;W. H. Hsu;M. Kichise;Y. Fujii;A. Koreeda;and T. Satoh
利用飞秒泵浦-探测技术研究了铁石榴石中相干光学声子的动力学行为。一个唯象的基于量子力学的考虑揭示了太赫兹T2 g模式的振荡被激发。线偏振泵浦的选择性激发和圆偏振探针的探测证实了脉冲受激拉曼散射（ISRS）是相干声子的驱动力。从ISRS测量获得的实验结果显示出良好的协议与自发拉曼光谱数据，分析考虑声子模式的对称性和相应的激发和检测选择规则。
We employed femtosecond pump-probe technique to investigate the dynamics of coherent optical phonons in iron garnet. A phenomenological symmetry-based consideration reveals that oscillations of the terahertz T 2g mode are excited. Selective excitation by a linearly polarized pump and detection by a circularly polarized probe confirm that impulsive stimulated Raman scattering (ISRS) is the driving force for the coherent phonons. Experimental results obtained from ISRS measurements reveal excellent agreement with spontaneous Raman spectroscopy data, analyzed by considering the symmetry of the phonon modes and corresponding excitation and detection selection rules.