超宽带太赫兹时域光谱探测技术研究进展

太赫兹时域光谱(THz time-domain spectroscopy,THz-TDS)技术是一种非常有效的相干探测技术,具有信噪比高,探测带宽,可在室温下工作,可进行时间分辨测量等特点,广泛应用于材料、化学、生物、安检等领域。较早时期的THz-TDS系统受限于太赫兹辐射源的带宽和光谱探测手段,测量范围有限(5THz),较高频段的光谱信息无法得到。为了进一步扩大太赫兹时域光谱探测技术的应用范围,迫切需要发展超宽带(≥10THz)的太赫兹时域光谱探测技术。本文回顾了太赫兹时域光谱探测技术的发展进程,综述了实现超宽带太赫兹时域光谱探测的主要技术方法,展示了不同测量方法的典型实验方案,同时总结了不同探测方法的优缺点,并追踪了主要研究小组的前沿成果以及最新的应用进展。

Progress of Detection Technology of Ultra-Broadband THz Time-Domain Spectroscopy

Terahertz Time-Domain Spectroscopy (THz-TDS)is one of the effective coherent detection techniques.It has been widely applied in materials,chemistry,biology,security and other fields due to its capabilities such as high signal-to-noise ratio (SNR),broadband detection,working at room temperature,time resolved measurement and others.Limited by the spectrum bandwidth of THz radiation and detection techniques,the measuring range of the traditional THz-TDS system is generally less than several THz,thus the spectral information of high frequencies cannot be obtained.In order to expand its application,there is an urgent need for the development of ultra-broadband (≥10 THz)THz-TDS detection techniques.This paper reviews the development and applications of main detection techniques in ultra-broadband THz-TDS.The advantages and disadvantages of these techniques are also analyzed.