Temperature-Dependent Refractive Index of Quartz at Terahertz Frequencies
Temperature-Dependent Refractive Index of Quartz at Terahertz Frequencies
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DOI：
10.1007/s10762-018-0538-7
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发表时间：
2018-12-01
影响因子：
2.9
通讯作者：
Johnston, Michael B.
中科院分区：
文献类型：
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作者：
Davies, Christopher L.;Patel, Jay B.;Johnston, Michael B.
材料的表征通常需要使用基底来支撑被研究的样品。对于太赫兹频率下的光学特性，通常使用石英，因为其在这些频率下的高透射率和低吸收率。石英的复折射率的知识是需要分析的时域太赫兹光谱和光泵太赫兹探测光谱的样品在石英基板上。在这里，我们提出的折射率和消光系数的α-石英在0.5太赫兹和5.5太赫兹（17-183厘米（-1））在10，40，80，120，160，200和300 K。石英显示出优异的透射率，因此是THz波段上的理想光学基底，除了3.9 +/- 0.1 THz区域之外，这是由于源自最低能量光学声子模式的光谱特征。我们还提出了实验测量的极化激元色散的α-石英在这个频率范围内。
Characterisation of materials often requires the use of a substrate to support the sample being investigated. For optical characterisation at terahertz frequencies, quartz is commonly used owing to its high transmission and low absorption at these frequencies. Knowledge of the complex refractive index of quartz is required for analysis of time-domain terahertz spectroscopy and optical pump terahertz probe spectroscopy for samples on a quartz substrate. Here, we present the refractive index and extinction coefficient for alpha-quartz between 0.5 THz and 5.5 THz (17-183 cm(-1)) taken at 10, 40, 80, 120, 160, 200 and 300 K. Quartz shows excellent transmission and is thus an ideal optical substrate over the THz band, apart from the region 3.9 +/- 0.1 THz owing to a spectral feature originating from the lowest energy optical phonon modes. We also present the experimentally measured polariton dispersion of alpha-quartz over this frequency range.