Terahertz Parametric Gain in Semiconductor Superlattices

TL;DR

This paper demonstrates the theoretical possibility of phase-sensitive parametric amplification in semiconductor superlattices, enabling efficient THz radiation conversion without negative differential conductance.

Contribution

It introduces a novel theoretical approach for THz parametric gain in superlattices that avoids destructive high-field domains.

Findings

Feasibility of phase-sensitive parametric amplification established

No need for negative differential conductance conditions

Potential for efficient THz frequency conversion

Abstract

We consider a high-frequency response of electrons in a single miniband of superlattice subject to dc and ac electric fields. Action of ac electric field causes oscillations of electron's effective mass in miniband, which result in a parametric resonance. We have established a theoretical feasibility of phase-sensitive parametric amplification at the resonance. The parametric amplification does not require operation in conditions of negative differential conductance. Therefore a formation of destructive domains of high electric field inside the superlattice can be prevented. Here we concentrate on the parametric up- and down-conversion of electromagnetic radiation from available frequencies to desirable THz frequency range.