Dielectric properties of crystalline BiOCl in the terahertz region
Dielectric properties of crystalline BiOCl in the terahertz region
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DOI：
10.1364/osac.399616
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
T. Unuma;T. Sasaki;K. Yamaki;A. Irie;H. Ishida;T. Kato
中科院分区：
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作者：
T. Unuma;T. Sasaki;K. Yamaki;A. Irie;H. Ishida;T. Kato
我们进行太赫兹（THz）透射光谱研究，以探究晶体BiOCl的折射率。在制造超导铋基太赫兹振荡器的某个过程中，BiOCl作为一种介电副产物出现。我们发现，对于平行于（001）面的太赫兹偏振，折射率为4.8或更高；这个值大大高于平行光偏振的光学折射率，也高于垂直电场的静态介电常数的平方根。我们的实验结果可以由之前一些理论研究预测的晶体BiOCl在低频下的强介电各向异性来解释。
We perform terahertz (THz) transmission spectroscopy to investigate the refractive index of crystalline BiOCl, which appears as a dielectric by-product during a certain process of fabricating superconducting Bi-based THz oscillators. We find that the refractive index is 4.8 or more for THz polarization parallel to the (001) plane; this value is substantially larger than the optical refractive index for parallel light polarization and also than the square root of the static dielectric constant for perpendicular electric field. Our experimental results can be interpreted from a strong dielectric anisotropy of crystalline BiOCl at low frequencies as predicted previously by a few theoretical studies.