Nonlinear ultrafast terahertz waveform modulation in highly n-doped In0.53Ga0.47As thin film

We study the nonlinear ultrafast carrier dynamics in highly n-doped In
_0.53
Ga
_0.47
As using terahertz (THz) time-domain spectroscopy (THz-TDS). In addition to the bleaching effect, we further observe significant THz waveform modulations and high frequency generations.