Application of Terahertz Field Enhancement Effect in Metal Microstructures
Application of Terahertz Field Enhancement Effect in Metal Microstructures
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DOI：
10.1007/s10762-016-0323-4
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发表时间：
2016-12-01
影响因子：
2.9
通讯作者：
Hangyo, M.
中科院分区：
文献类型：
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作者：
Nakajima, M.;Kurihara, T.;Hangyo, M.
高场太赫兹脉冲在物理学和太赫兹技术领域具有广泛的应用前景。在本研究中，演示了两种与高强度太赫兹脉冲相关的应用。利用亚波长金属微结构的场增强效应进行太赫兹激发测量。用太赫兹磁场诱导磁性材料的自旋进动。在具有金属微结构的ErFeO3中，增强的太赫兹磁场使自旋进动的幅度放大了一个数量级。用LLG-LCR模型对诱导自旋动力学进行了分析和解释。此外，还研究了一种在室温下不使用任何电子器件的胆甾型液晶对太赫兹脉冲的检测方法。利用热释电探测器和微辐射热计阵列，将太赫兹脉冲的光束轮廓可视化，并与其他方法如刀口法进行了比较。液晶太赫兹成像仪结构简单，作为便携式太赫兹感应卡具有良好的适用性。
Applications of high-field terahertz pulses are attractive in physics and terahertz technology. In this study, two applications related to high-intensity terahertz pulses are demonstrated. The field enhancement effect by subwavelength metallic microstructures is utilized for terahertz excitation measurement. The spin precession dynamics in magnetic materials was induced by a terahertz magnetic field. Spin precession was amplified by one order of magnitude in amplitude by the enhanced magnetic terahertz field in orthoferrite ErFeO3 with metal microstructures. The induced spin dynamics was analyzed and explained by LLG-LCR model. Moreover, a detection method for terahertz pulses was developed using a cholesteric liquid crystal at room temperature without any electronic devices. The beam profile of terahertz pulses was visualized and compared to other methods such as the knife edge method using pyroelectric detector and micro-bolometer array. The liquid crystal terahertz imager is very simple and has good applicability as a portable terahertz-sensing card.