| 飞秒光诱导铽镓石榴石晶体中的磁化响应研究 |
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| 引用本文： | 金钻明,郭飞云,马红,王立华,马国宏,陈建中.飞秒光诱导铽镓石榴石晶体中的磁化响应研究[J].物理学报,2011,60(8):87803-087803. |
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| 作者姓名： | 金钻明 郭飞云 马红 王立华 马国宏 陈建中 |
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| 作者单位： | 1. 上海大学物理系,上海 200444;
2. 福州大学化学化工学院,福建 350002 |
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| 基金项目： | 国家自然科学基金(批准号:10774099,50772023)、上海市科学技术委员会应用基础研究计划(批准号:09530501100)、上海市高等学校特聘教授 (东方学者) 岗位计划、上海市重点学科建设基金(批准号:S30105)、国家光电子晶体材料工程技术研究中心基金(批准号:2005DC105003)和上海大学研究生创新基金(批准号:SHUCX102006)资助的课题. |
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| 摘 要： | 运用时间分辨抽运-探测光谱技术,研究了磁光晶体铽镓石榴石(TGG)在不同椭圆偏振态的飞秒激光脉冲诱导下的极化和磁化响应.研究表明,当仅存在逆法拉第效应时,探测光旋转角信号和椭圆率信号的变化方向与圆偏振抽运光的旋向相关.这是由于圆偏振光在TGG晶体中产生的瞬态有效磁场的方向依赖于圆偏振光的旋向所致.光诱导磁化过程与材料的性质有关,TGG晶体的顺磁特性决定了其自旋弛豫时间为几十飞秒.由于探测光旋转角信号和椭圆率信号的半高全宽均为500 fs左右,加之信号强度随着抽运光脉冲能量密度的增加呈线性增长,表明TGG晶
关键词：
铽镓石榴石晶体
抽运-探测光谱技术
逆法拉第效应
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| 关 键 词： | 铽镓石榴石晶体 抽运-探测光谱技术 逆法拉第效应 |
| 收稿时间： | 2010-09-28 |
Femtosecond photoinduced magnetization of terbium gallium garnet crystal |
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| Jin Zuan-Ming,Guo Fei-Yun,Ma Hong,Wang Li-Hu,Ma Guo-Hong and Chen Jian-Zhong.Femtosecond photoinduced magnetization of terbium gallium garnet crystal[J].Acta Physica Sinica,2011,60(8):87803-087803. |
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| Authors: | Jin Zuan-Ming Guo Fei-Yun Ma Hong Wang Li-Hu Ma Guo-Hong and Chen Jian-Zhong |
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| Institution: | Department of Physics, Shanghai University, Shanghai 200444, China;College of Chemistry and Chemistry Engineering, Fuzhou University, Fuzhou 350002, China;Department of Physics, Shanghai University, Shanghai 200444, China;Department of Physics, Shanghai University, Shanghai 200444, China;Department of Physics, Shanghai University, Shanghai 200444, China;College of Chemistry and Chemistry Engineering, Fuzhou University, Fuzhou 350002, China |
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| Abstract: | The photoinduced magnetization in magneto-optical crystal terbium gallium garnet (TGG) is investigated by time-resolved pump-probe spectroscopy. When the pump pulse is elliptically polarized, the rotation signal and the ellipticity signal of the probe pulse are observed at zero time delay, resulting from the optical Kerr effect and the inverse Faraday effect. The direction of the effective magnetic field is dominated by the helicity of the pump pulse, so the rotation signal and the ellipticity signal of the probe pulse can be triggered selectively by modifying the helicity of the pump pulse. The full widths at half maximum of the rotation signal and the ellipticity signal both can be as fast as about 500 fs, which indicates that TGG crystal is expected to be a candidate material of ultrafast all-optical magnetic switching. |
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| Keywords: | terbium gallium garnet pump-probe spectroscopy inverse Faraday effect |
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