A phonon scattering assisted injection and extraction based terahertz quantum cascade laser
Abstract
A novel lasing scheme for terahertz quantum cascade lasers, based on consecutive phonon-photon-phonon emissions per module, is proposed and experimentally demonstrated. The charge transport of the proposed structure is modeled using a rate equation formalism. An optimization code based on a genetic algorithm was developed to find a four-well design in the material system that maximizes the product of population inversion and oscillator strength at 150 K. The fabricated devices using Au double-metal waveguides show lasing at 3.2 THz up to 138 K. The electrical characteristics display no sign of differential resistance drop at lasing threshold, which suggests - thanks to the rate equation model - a slow depopulation rate of the lower lasing state, a hypothesis confirmed by non-equilibrium Green's function calculations.
Cite
@article{arxiv.1201.4189,
title = {A phonon scattering assisted injection and extraction based terahertz quantum cascade laser},
author = {E. Dupont and S. Fathololoumi and Z. R. Wasilewski and G. Aers and S. R. Laframboise and M. Lindskog and A. Wacker and D. Ban and H. C. Liu},
journal= {arXiv preprint arXiv:1201.4189},
year = {2015}
}
Comments
11 pages, 10 figures