Abstract
We present a calculation of terahertz (THz) radiation by coherent optical phonons in GaAs p–i–n diode structure under high electric fields. The ultrafast dynamics of photoexcited carriers is simulated by adopting a self-consistent ensemble Monte Carlo method. It is demonstrated that the coherent phonon oscillations emitting the THz radiation are excited resonantly by synchronization between the proper lattice oscillation and ultrafast transient of electronic polarization originating from a drift overshoot within the initial period of lattice vibration.
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