Sub-THz/THz amplification in a semiconductor superlattice

We examine the feasibility of amplification of the electromagnetic signal in semiconductor superlattice by moving charge domains, which are generated in superlattice by applied DC bias. We show that an external resonator connected to the semiconductor superlattice significantly broadens the frequency range of amplified signals to the higher harmonics of domain transient frequency. These promising results open the way to use semiconductor superlattices as the efficient sub-THz/THz amplifiers.