Subject：Time-resolved infrared and Terahertz spectroscopy of semiconductor quantum structures

(半导体量子结构的红外和太赫兹时间分辨光谱)

Lecturer：Prof. Harald Schneider

（Institute of Ion-Beam Physics and Materials Research, Forschungszentrum Dresden Rossendorf (FZD), Dresden, Germany）

Time：June 22, 2009 （Monday）2: 30pm

Place：Transient Optics Department 3F meeting room 

Prof. Harald Schneider

Harald Schneider did his Ph. D. at the Max-Planck Institute for Solid-State Research, Stuttgart, Germany, in 1988. In 1989 he moved to the Fraunhofer-Institute for Solid State Physics, Freiburg, Germany, and in 2005 to the Forschungsszentrum Dresden Rossendorf, Dresden, Germany, where he is currently working as a department head. His research interests include optoelectronic properties of semiconductors, ultrafast and free-electron laser based spectroscopy, and detectors for the infrared and THz regimes. For the development of infrared cameras of highest thermal resolution, he and his colleagues were awarded the 2001 German Science Foundation Award. He has co-authored more than 190 publications.

Abstract

This talk summarizes our activities in nonlinear laser spectroscopy using the free-electron laser at FZD and tabletop lasers. Our research concentrates on III-V semiconductor quantum wells and superlattices. In particular, I will focus on pump-probe spectroscopy, two-photon absorption, and photocurrent autocorrelation involving intersubband transitions in quantum wells at mid-infrared wavelengths, and discuss a concept for scalable photoconductive Terahertz emitters.