A novel method to process the THz time-domain spectrum and software to make data visualization

Terahertz (THz) time-domain spectrum has been widely adopted as the de facto technique to inspect the physical characteristics of materials and to detect defects in bulks. However, the time series generated by scans are usually noisy and consist of minor peaks induced by the reflection of the defects inside the materials. To improve the quality of the data and to argument the frequency-domain spectrum of the signal, a Wiener filter modified by a time window is implemented to improve the dynamic range and the bandwidth of the frequency-domain spectrum. Software to make complex THz spectroscopy analysis and data visualization is developed, and the filters are expected to integrate into the numerical library of the software.