. According to ratio of the amplitude spectra of a reference measurement (nitrogen) and a sample in the THz-TDS, frequency dependent absorbance spectra are obtained as shown in Fig. 3(b) [30].
. According toratio of the amplitude spectra of a reference measurement (nitrogen)and a sample in the THz-TDS, frequency dependent absorbancespectra are obtained as shown in Fig. 3(b) [30].