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Volume 103, Issue 12, 15 June 2008
103(2008); http://dx.doi.org/10.1063/1.2946717View Description Hide Description
The conditions for terahertz power generation are investigated theoretically in a nanoscale GaN-based diode coupled to an external resonant circuit for operation in the limited space-charge accumulation (LSA) mode under the high-field transport regime. The generation criteria are revisited in terms of a phase plane analysis of the diode high-field transport and circuit equations. Based on a Fourier seriesanalysis, the waveforms of the diode voltage and current are examined and the generated power and conversion efficiencies are estimated at the fundamental and lowest harmonic frequencies. The advantages of group-III nitride LSA diodes are elucidated including their ability to simultaneously achieve large output powers and high dc-to-rf conversion efficiencies over a wide range of frequencies near 1 THz.