Numerical Demonstration of THz Traveling Wave Amplifications in 2DElectron Gas (2DEG) under Scattering-Free and Low-Charge DensityRegime

—In this paper we investigate the dynamics ofinteractions of terahertz fluctuations of electrons in a 2D electrongas (2DEG) and slow-wave its vicinity under low charge densityand scattering-free regime. The dynamics of this interactionare simulated with the use of a CPW connected interdigitatedmetal grating structure to provide electromagnetic waves withphase velocity comparable to electron drift in the 2DEG channel.The paper will demonstrate that such slow-wave structures canprovide interaction of electron gas and electromagnetic wavesleading to amplification of density and velocity fluctuationsat 300 GHz. The method used for this numerical work isa full-wave-global model that uses FDTD-based particle incell solver of electron transport in 2DEG, with self-consistentelectromagnetic field solver. Under the considered regime anddevice, the current oscillations show increase in amplitude whichillustrates the effect of synchronous interaction between the2DEG.