Abstract
THz time-domain spectroscopy (THz-TDS) has provided an important approach to investigate the optical properties of various materials. A four-mirror transmission geometry set-up is usually applied to characterize materials with good transparency in the THz frequency range, in which the THz beam can be tightly focused onto the sample. However, a focus displacement induced by the sample will influence the accuracy of the quantitative values of the optical constants, which has not been discussed in detail up to now.
© 2015 IEEE
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