Nonlinear ultrafast modulation of the optical absorption of few cycle terahertz pulses in n-doped semiconductors

Abstract

We use an open-aperture Z-scan technique to show how intense few-cycle terahertz pulses can experience a nonlinear bleaching of absorption in an n-doped semiconductor due to terahertz-electric-field-driven intervalley scattering of electrons in the conduction band. Coherent detection of the transmitted terahertz pulse waveform also allows the nonlinear conductivity dynamics to be followed with sub-picosecond time resolution. Both the Z-scan and time-domain results are found to be in agreement with our theoretical analysis.

Submitted to Physical Review B, 16 pages, 3 figures, 1 table

References in corpus (1)

• Impact ionization in InSb probed by THz-pump THz-probe spectroscopy

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