Terahertz spectroscopy
Terahertz spectroscopy
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DOI：
10.1021/jp020579i
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发表时间：
2002-07-25
影响因子：
3.3
通讯作者：
Schmuttenmaer, CA
中科院分区：
文献类型：
--
作者：
Beard, MC;Turner, GM;Schmuttenmaer, CA
太赫兹光谱出现于大约 13 年前，其证明可以产生近单周期的远红外辐射脉冲，通过自由空间传播，并随后在时域中进行检测。从那时起，太赫兹光谱在从凝聚态物理到气相光谱再到生物医学成像的研究中发现了广泛的适用性。在本文中，以耶鲁大学 Schmuttenmaer 实验室正在进行的工作为背景描述了太赫兹光谱的特性和应用。特别是，研究表明，光泵-太赫兹探针配置可以阐明诸如液体中低频集体溶剂模式的响应以及各种半导体系统（例如块状 GaAs、低温生长 GaAs、纳米晶胶体 TiO2 和 CdSe 量子点）中的瞬态光电导等现象。此外，还讨论了最近以非常直接的方式测量电荷转移的实验。
Terahertz spectroscopy emerged about 13 years ago with the demonstration that nearly single-cycle pulses of far-infrared radiation could be generated, propagated through free space, and subsequently detected in the time-domain. Since then, THz spectroscopy has found widespread applicability with studies ranging from condensed matter physics to gas-phase spectroscopy to biomedical imaging. In this article, the properties and applications of THz spectroscopy are described in the context of work being done in the Schmuttenmaer labs at Yale University. In particular, it is shown that an optical pump-THz probe configuration can elucidate phenomena such as the response of low-frequency collective solvent modes in liquids, and transient photoconductivity in a variety of semiconductor systems, such as bulk GaAs, low-temperature grown GaAs, nanocrystalline colloidal TiO2, and CdSe quantum dots. In addition, recent experiments measuring charge transfer in a very direct manner are discussed.