ABSTRACT
This chapter analyzes the operation of a resonant detector of terahertz (THz) radiation based on a two-dimensional electron gas channel with split gates. The side gates are used for the excitation of plasma oscillations by incoming THz radiation and control of the resonant plasma frequencies. The chapter calculates the frequency and temperature dependences of the detector responsivity associated with both dynamic and heating mechanisms. Plasma oscillations in heterostructures with a two-dimensional electron gas and some devices using the excitation of these oscillations have been experimentally studied over decades. The chapter develops a device model for a THz resonant detector based on a heterostructure with the two-dimensional electron gas channel and the barrier region utilizing the plasma oscillations excitation. The electron transport in the channel is governed by the hydrodynamic equations coupled with the Poisson equation for the self-consistent electric potential.
