The measurement principle is based on the attenuated total reflection (ATR) technique. As shown in the figure, terahertz waves are totally reflected by the sample measurement surface on the total reflection prism. At this point, the evanescent wave exudes into the sample.
The exuded evanescent wave interferes with the sample placed on the measurement surface which attenuates the reflectance of terahertz waves. Detecting this attenuated reflectance yields spectral information (absorption coefficient, refractive index and complex permittivity) in the terahertz band from the sample.
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