Monte-Carlo-based spectral gain analysis for THz quantum cascade lasers

TL;DR

This paper uses Monte Carlo simulations to analyze spectral gain in THz quantum cascade lasers, considering various design and scattering mechanisms, and compares results with experimental data to understand temperature effects.

Contribution

It introduces a self-consistent Monte Carlo approach to analyze spectral gain and scattering effects in THz quantum cascade lasers, enhancing understanding of temperature performance.

Findings

Good agreement between simulation and experimental data

Temperature-dependent gain broadening impacts performance

Scattering mechanisms significantly influence spectral gain

Abstract

Employing an ensemble Monte Carlo transport simulation, we self-consistently analyze the spectral gain for different THz quantum cascade laser structures, considering bound-to-continuum as well as resonant phonon depopulation designs. In this context, we investigate temperature dependent gain broadening, affecting the temperature performance of THz structures. Furthermore, we discuss the influence of the individual scattering mechanisms, such as electron-electron, impurity and interface roughness scattering. A comparison of the simulation results to experimental data yields good agreement.