  Semiconductor superlattice multipliers have emerged as a nonlinear medium
capable to generate radiation in a wide frequency range. This property
facilitates the potential of sources suitable for sensing and spectroscopy
applications. In this study, we further investigate the consequences on
harmonic generation in a superlattice multiplier after excitation by an input
signal oscillating at different frequencies. Here we provide a rigorous
description of our theoretical model including a semiclassical Boltzmann
approach to nonlinear miniband transport and non-equilibrium Greens functions
calculations treating scattering processes under forward and reverse bias. To
fully exploit the features of this radiation source, we focus on the effects of
elastic scattering and systemat-ic imperfections in the superlattice structure
which lead to asymmetric current flow.
