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

TL;DR

This paper compares FFT, CZT, and Zoom FFT transforms in THz-TDS to evaluate their resolution enhancement potential and computational efficiency, concluding FFT is most efficient for practical purposes.

Contribution

It provides a comparative analysis of FFT, CZT, and Zoom FFT in THz-TDS, highlighting that FFT remains the most computationally efficient despite similar resolution limits.

Findings

FFT is the most computationally efficient in practical cases.

CZT and Zoom FFT do not improve resolution over FFT.

Resolution cannot be enhanced using CZT or Zoom FFT.

Abstract

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.