I review recent development of the terahertz time domain spectroscopy and its application to solids. This spectroscopy is unique in that the time-domain wave forms are measured at first and the complex optical constants are deduced directly by the Fourier transformation of them without resort to the Kramers-Kronig analysis. Various types of the THz-TDS systems are briefly described. Applications of the THz-TDS to semiconductors, polymers, biomolecules, superconductors, and so on are presented to demonstrate how widely this spectroscopy is applicable to characterization of solids.
テラヘルツ時間領域分光法の近年の発達と固体への利用について紹介します。この分光法は電場の時間波形を測定し、フーリエ変換を用いることでクラマークローニッヒ変換を使わずに光学定数を直接求めることができます。今回の発表ではテラヘルツ時間領域分光法について簡単に説明し,半導体、高分子、生体分子、超伝導体など固体への幅広い応用について紹介します。