Three time-resolved terahertz (THz) spectroscopy methods (optical-pump/THz-probe spectroscopy, THz-pump/THz-probe spectroscopy, and THz-pump/optical-probe spectroscopy) are reviewed. These are used to characterize ultrafast dynamics in photo- or THz-excited semiconductors, superconductors, nanomaterials, and other materials. In particular, the optical-pump/THz-probe spectroscopy is utilized to investigate carrier dynamics and the related intervalley scattering phenomena in semiconductors. The recent development of intense pulsed THz sources is expected to affect the research in nonlinear THz responses of various materials.
© 2011 Chinese Optics Letters
Spectroscopy, imaging, and sensing using terahertz radiation
Qingli Zhou and Xicheng Zhang, "Applications of time-resolved terahertz spectroscopy in ultrafast carrier dynamics (Invited Paper)," Chin. Opt. Lett. 9, 110006- (2011)