An automatic unfolding method for terahertz spectra

Terahertz (THz) time domain spectroscopy is considered as an attractive tool for material diagnostics and analysis. Despite existing characteristic fingerprints in THz spectra, extraction of these feature information is tough to achieve because of scattering phenomenon. Several methods have been proposed for mitigating scattering effects. However, little attempts are made to unfold THz spectra for extracting parameters of absorption peaks with the distraction of scattering. In this report, an automatic unfolding method for THz spectra is proposed based on multidimensional peak searching and quadratic programming. The obtained Lorentzian parameters for the absorption peaks are accurate and repeatable, thus holding potential for material recognition and quantitative analysis.