<title>Monte Carlo simulation of small- and large-signal response operation of a GaN THz maser</title>

Amplification and generation of microwave radiation by optical phonon transit-time resonance GaN THz maser is investigated theoretically by Monte Carlo simulations. Results confirm that GaN is a promising material for THz power generation. The amplification and generation occurs in the wide frequency range of 0.3 to 3 THz and persists in the THz frequency range up to liquid nitrogen temperatures and doping levels of about 5 X 10¹⁶ cm^-3.