Time-Domain Magnetic Field-Difference Spectroscopy for Semiconductors Using Circularly Polarized Terahertz Pulses
Time-Domain Magnetic Field-Difference Spectroscopy for Semiconductors Using Circularly Polarized Terahertz Pulses
复制标题
使用圆偏振太赫兹脉冲的半导体时域磁场差光谱
DOI：
10.1109/tthz.2019.2951055
复制
发表时间：
2020
影响因子：
3.2
通讯作者：
M. Ashida
中科院分区：
文献类型：
--
作者：
M. Nagai;Atsushi. Nakane;Hiroyasu Suzukawa;T. Morimoto;M. Ashida
我们提出了一种简单的方法，灵敏的磁光光谱在太赫兹（THz）频率制度，而不需要检测两个正交偏振场分量。这种简单的方法是基于时域反射光谱，并采用了一个单一的圆偏振状态下的磁场，这是由一个旋转的磁盘与永磁体调制的探测自由载流子。所评估的调制信号直接反映了对半导体中自由载流子特性敏感的法拉第/克尔椭圆率和旋光度。我们目前的结果的磁光克尔光谱的n-和p-Ge基板上具有不同的载流子浓度和InSb。实验结果表明，在等离子体频率附近，克尔椭圆率和旋光度较大。由于法拉第效应，我们还观察到了从低载流子浓度样品的背面反射的增强的太赫兹脉冲的调制信号。基于一个简单的自由载流子模型的数值模拟再现我们的实验结果很好。我们的演示将有助于推进各种半导体的多用途表征技术。
We propose a simple method for sensitive magneto-optic spectroscopy in the terahertz (THz) frequency regime without the need for detecting two orthogonally polarized field components. This simple method is based on the time-domain reflection spectroscopy and employs a single circular polarization state for probing free carriers under a magnetic field that is modulated by a rotating disk with permanent magnets. The evaluated modulation signal directly reflects the Faraday/Kerr ellipticity and optical rotation, which are sensitive to the characteristics of free carriers in semiconductors. We present results of the magneto-optic Kerr spectroscopy on n- and p-Ge substrates with different carrier concentrations and InSb. The experimental results indicate larger Kerr ellipticity and optical rotation near the plasma frequency. Due to the Faraday effect, we also observe an enhanced modulation signal of the THz pulse reflected from the backside surface of the low-carrier-concentration sample. Numerical simulations based on a simple free-carrier model reproduce our experimental results well. Our demonstration will help to advance multipurpose characterization techniques for various semiconductors.
影响因子：
16.6
作者：
Ryo Shimano;Go Yumoto;J. Y. Yoo;Ryusuke Matsunaga;Shin-ichi Tanabe;Hiroki Hibino;Takahiro Morimoto;Hideo Aoki
通讯作者：
Ryo Shimano;Go Yumoto;J. Y. Yoo;Ryusuke Matsunaga;Shin-ichi Tanabe;Hiroki Hibino;Takahiro Morimoto;Hideo Aoki
太赫兹波谱的评估和使用掺镱光纤激光器的太赫兹波传感系统的构建
DOI：
--
发表时间：
2007
期刊：
J. Opt. Soc. Am. B 24(8)
影响因子：
--
作者：
A. Syouji;S. Saito;K. Sakai;M. Nagai;K. Tanaka;H. Ohtake;T. Bessho;T. Sugiura;T. Hirosumi;M. Yoshida
通讯作者：
M. Yoshida