The Christiansen effect in terahertz time-domain spectra of coarse-grained powders
The Christiansen effect in terahertz time-domain spectra of coarse-grained powders
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DOI：
10.1063/1.2831910
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发表时间：
2008-01-14
影响因子：
4
通讯作者：
Walther, Markus
中科院分区：
文献类型：
--
作者：
Franz, Morten;Fischer, Bernd M.;Walther, Markus
光谱畸变通常在浸没在透明基质中的地面物质的太赫兹透射光谱中观察到。这种效应源于颗粒和稀释剂之间的折射率对比引起的散射。一个唯象表达式定量地解释了散射引起的衰减和通过样品传输的电场所经历的相位延迟。基于对样品和基质材料折射率的了解，我们提出了一种从吸收光谱中消除散射贡献的方法。
Spectral distortions are commonly observed in terahertz transmission spectra of ground substances immersed in a transparent host medium. This effect originates from scattering due to the index contrast between the grains and diluent. A phenomenological expression quantitatively accounts for the scattering induced attenuation and the phase delay experienced by the electric field transmitted through the sample. Based on the knowledge of the refractive indices of the sample and the host material, we present a procedure to eliminate the scattering contribution from the absorption spectra.