Principle of Terahertz Time-Domain Spectroscopy

TL;DR

This paper reviews the principles, characteristics, and recent developments of terahertz time-domain spectroscopy (THz-TDS), including various detection schemes and innovative techniques like single-shot and asynchronous sampling.

Contribution

It provides a comprehensive overview of THz-TDS principles and introduces four recent advancements in the field.

Findings

Comparison of electro-optic and photoconductive sampling methods

Introduction of four recent THz-TDS developments

Analysis of their principles and characteristics

Abstract

In this work, the detection of terahertz (THz) pulse via different schemes of THz time-domain spectroscopy (THz-TDS), including electro-optic sampling (EOS) and photoconductive sampling (PCS), has been reviewed by insisting on its principles and characteristics. Furthermore, four developments of THz-TDS, i.e. THz air-breakdown/biased coherent detection (THz-ABCD), THz-radiation-enhanced emission of fluorescence (THz-REEF), single-shot THz-TDS, and THz asynchronous optical sampling (THz-ASOPS) have also been introduced.