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The performance of an on-chip Terahertz (THz) source based on the Dyakonov-Shur (DS) instability is analytically and numerically investigated. The impact of nonideal termination impedances at the source and the drain of a III-V semiconductor-based HEMT-like plasmonic cavity is first studied in the linear approximation of the hydrodynamic model. Then, a multiphysics simulation platform that self-consistently solves the full hydrodynamic model and Maxwell’s equations is developed and utilized to numerically investigate the effects of the finite termination impedances on the DS instability, the generated plasmonic current, and the radiated THz electromagnetic signals in the steady state. The results show that nonideal boundary conditions at the cavity terminations can drastically impact the DS instability and reduce the generated and radiated THz em signals.

Plasmonic HEMT Terahertz Transmitter based on the Dyakonov-Shur Instability: Performance Analysis and Impact of Nonideal Boundaries