Self-phase modulation of a single-cycle terahertz pulse by nonlinear free-carrier response in a semiconductor

@inproceedings{Turchinovich2012SelfphaseMO,
  title={Self-phase modulation of a single-cycle terahertz pulse by nonlinear free-carrier response in a semiconductor},
  author={Dmitry Turchinovich and Jorn Maercher Hvam and M C Hoffmann},
  year={2012}
}
We investigate the self-phase modulation (SPM) of a single-cycle terahertz pulse in a semiconductor, using bulk n-GaAs as a model system. The SPM arises from the heating of free electrons in the electric field of the terahertz pulse, leading to an ultrafast reduction of the plasma frequency, and hence to a strong modification of the terahertz-range dielectric function of the material. Terahertz SPM is observed directly in the time domain. In the frequency domain it corresponds to a strong… CONTINUE READING

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