Comparison of THz-QCL Designs Supporting Clean N-Level Systems

Three different Terahertz quantum-cascade-laser designs supporting clean n-level systems were analyzed using nonequilibrium Green’s functions. In systems, most of the electrons occupy active laser levels, with thermally activated leakage channels being suppressed almost entirely up to room temperature. Simulations three designs, namely a resonant phonon design, two-well and split-well direct-phonon design investigated. The results from simulations indicated that would perform best overall, in terms variations current density, interface roughness, ionized impurity scattering. We conclude future research aiming improve temperature performance such should be based on design.