Comparison of computing efficiency among FFT, CZT and Zoom FFT in THz-TDS

A study of alternative transforms to FFT in order to compare their potential to enhance resolution and computation time in the framework of THz time domain spectroscopy (THz-TDS) instruments is carried out. Both from simulated and experimental data it is shown that, as expected, resolution cannot be enhanced using CZT or Zoom FFT and, in terms of computing efficiency, FFT is in practical cases, the most efficient one.