Generation of coherent terahertz radiation due to optical-phonon emission assisted transit-time resonance in quantum wells and heterolayers

Abstract

To analyze the main features of THz radiation generation caused by optical-phonon transit-time resonance a simplified analytical model is developed in terms of some generalized parameters of bulk materials and 2D structures. In the framework of such a model and direct Monte Carlo simulations an increase up to 5 times of the cutoff frequency for THz radiation generation is predicted going from 3D and 2D transport.