Abstract
We use an open-aperture scan technique to show how intense few-cycle terahertz pulses can experience a nonlinear bleaching of absorption in an -doped semiconductor due to terahertz-electric-field-driven intervalley scattering of electrons in the conduction band. Coherent detection of the transmitted terahertz pulse wave form also allows the nonlinear conductivity dynamics to be followed with subpicosecond time resolution. Both the scan and time-domain results are found to be in agreement with our theoretical analysis.
- Received 6 November 2008
DOI:https://doi.org/10.1103/PhysRevB.79.193204
©2009 American Physical Society