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Measurements of the Carrier Dynamics and Terahertz Response of Oriented Germanium Nanowires using Optical-Pump Terahertz-Probe Spectroscopy

机译：使用光泵太赫兹-探针光谱法测量定向锗纳米线的载流子动力学和太赫兹响应

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摘要

We have measured the terahertz response of oriented Germanium nanowires using ultrafast optical-pump terahertz-probe spectroscopy. We present results on the time, frequency, and polarization dependence of the terahertz: response. Our results indicate intraband energy relaxation times of photoexcited carriers in the 1.5-2.0 ps range, carrier density dependent interband electron-hole recombination times in the 75-125 ps range, and carrier momentum scattering rates in the 60-90 fs range. Additionally, the terahertz response of the nanowires is strongly polarization dependent despite the subwavelength dimensions of the nanowires, The differential terahertz transmission is found to be large when the field is polarized parallel to the nanowires and very small when the field is polarized perpendicular to the nanowires. This polarization dependence of the terahertz response can be explained in terms of the induced depolarization fields and the resulting magnitudes of the surface plasmon frequencies.
机译：我们已经使用超快光泵太赫兹-探针光谱法测量了定向锗纳米线的太赫兹响应。我们介绍了有关太赫兹响应的时间，频率和极化相关性的结果。我们的结果表明，光激发载流子的带内能量弛豫时间在1.5-2.0 ps范围内，与载流子密度相关的带间电子-空穴复合时间在75-125 ps范围内，载流子动量散射率在60-90 fs范围内。此外，尽管纳米线的子波长尺寸不同，纳米线的太赫兹响应仍强烈依赖于极化。发现当电场平行于纳米线极化时，差分太赫兹透射很大，而当电场垂直于纳米线极化时，太赫兹透射很小。 。太赫兹响应的这种偏振相关性可以用感应的去极化场和表面等离子体激元频率的幅度来解释。

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