THz waveform shifting and broadening along a DC electric field biased femtosecond laser plasma filament

The terahertz waveform undergoes a shifting of 0.43 ps and broadening of 0.46 ps in the time domain during its propagation in the 40 mm long filament. Both experimental and numerical results have proved that the propagation of THz in a DC-biased filament waveguide leading to the terahertz waveform shifting and broadening.