Monte Carlo Calculations of THz Generation in Nitrides

The electromagnetic power generation associated with the optical-phonon transit-time resonance of a nitride-based maser is analyzed by Monte Carlo simulations under small- and large-signal regimes. Numerical results show that a dynamic negative differential mobility occurs in a wide frequency range with an optimal generation frequency easily tunable in the terahertz range by varying the static electric field strength. The generation phenomena are present up to the liquid nitrogen temperature with reasonably high values of the amplification coefficient. The efficiency of the amplification and generation is found to depend nonmonotonously on static and microwave electric field amplitudes, generation frequency, and doping level, so that for each generation frequency there exists an optimal range of parameter values. A comparative study among the performances of different nitrides is also reported.