Temperature-dependent terahertz magnetic dipole radiation from antiferromagnetic GdFeO3 ceramics

Temperature-dependent terahertz magnetic dipole radiation from antiferromagnetic GdFeO3 ceramics
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反铁磁 GdFeO3 陶瓷的温度依赖性太赫兹磁偶极子辐射

DOI:
10.1063/1.4832355
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发表时间:
2013-11
影响因子:
4
通讯作者:
Zhou, Ji
Zhou, Ji
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fu, Xiaojian;Xi, Xiaoqing;Bi, Ke;Zhou, Ji

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本文从理论和实验两个方面研究了反铁磁性GdFeO_3陶瓷中的太赫兹磁偶极子辐射。引入了一个二能级量子跃迁机制来描述激发-辐射过程,并从这个过程中自旋态密度的变化解析地推导了辐射寿命。太赫兹光谱测量表明,随着温度的升高,辐射频率出现红移,寿命缩短,这与理论预测一致。温度敏感的辐射频率和良好的太赫兹发射意味着反铁磁性陶瓷在太赫兹传感器和频率可调谐太赫兹激光器中显示出潜在的应用前景。
Temperature-dependent terahertz magnetic dipole radiation in antiferromagnetic GdFeO3 ceramic is investigated both theoretically and experimentally in this work. A two-level quantum transition mechanism is introduced to describe the excitation-radiation process, and radiative lifetime is derived analytically from the change of spin state density during this process. Terahertz spectral measurements demonstrate that the radiative frequency exhibits a red-shift and lifetime shortens as temperature increases, which is in good agreement with theoretical predictions. The temperature-sensitive radiative frequency and excellent terahertz emission mean that the antiferromagnetic ceramics show potential for application in terahertz sensors and frequency-tunable terahertz lasers.
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