Terahertz Time-Domain Spectroscopy and Dispersive Fourier Transform Spectroscopy: Two Sides of the Same Coin.

The parallels between terahertz time-domain spectroscopy (THz-TDS) and discrete Fourier transform spectroscopy (DFTS) are unraveled by showing that the same Fresnel equation links the optical properties of a material to measurements obtained using either approach. Such similarities are revealed by evaluating this same Fresnel equation incorporating either THz-TDS or DFTS measurement data, permitting the optical material properties (i.e., refractive index and extinction coefficient) to be obtained from the sample under investigation. The aim of this study is to highlight the likenesses between THz-TDS and DFTS in characterizing optical material properties and, in doing so, stimulate collaboration between individuals conducting research in the realms of infrared and terahertz spectroscopy. [ABSTRACT FROM AUTHOR]