title: Terahertz tomography of a photo-induced carrier based on pump-probe spectroscopy using counterpropagation geometry.
abstract: A novel technique for the terahertz (THz) tomography of a photo-induced carrier that is based on optical-pump THz-probe time-resolved reflection spectroscopy using counterpropagation geometry of the pump and probe pulses has been proposed. Transient reflection due to the photo-induced carrier provides information about the physical properties and spatial distribution separately. We have experimentally demonstrated this method using a silicon wafer. The obtained complex reflection can be reproduced by the exact solution of Maxwell's equations, assuming an exponential distribution of the photo-induced carrier density.
authors.affiliation: Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizugawa, Kyoto, Japan. tsubouchi.masaaki@jaea.go.jp
authors.forename: Masaaki
authors.initials: M
authors.lastname: Tsubouchi
authors.forename: Masaya
authors.initials: M
authors.lastname: Nagai
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ohshima