Terahertz (THz) emission spectroscopy is a powerful method that allows one to measure the ultrafast dynamics of polarization, current, or magnetization in material based on THz from material. However, practical implementation this can be challenging, and result significant errors reconstruction quantity interest. Here, we experimentally theoretically demonstrate rigorous signal spectroscopy, de...

In this paper we discuss the problem of signal reconstruction from spectral magnitude or phase using group delay functions. We define two separate group delay functions for a signal, one is derived from the magnitude and the other from the phase of the Fourier transform of the signal. The group delay functions offer insight into the problem of signal reconstruction and suggest methods for recon...