Two decades of terahertz cross-correlation spectroscopy

Terahertz cross-correlation spectroscopy enables phase-sensitive measurements without the need for a laser source and, hence, presents cost-efficient and versatile alternative to common terahertz time-domain approaches. This review article development of this technique over past two decades as well applications approach. It is completed by detailed mathematical description proving irrelevance optical phases employed pump light modes. Numerical investigations resulting signal demonstrate applicability are compared state-of-the-art measurements. valuable moderate-demand already. Further possible improvements discussed.