QUANTUM CASCADE LASER SYSTEMS BASED ON NANOMATERIALS FOR BIOLOGICAL APPLICATIONS: SIMULATION AND MODELING

Our research subject aims to study a laser system based on nanomaterials, for possible biological applications. So far we have examined the performance of a quantum well structure, composed of a quantum well based on InGaN, and two barriers based on GaN, it is a three-level system: a reservoir state (RS) receiving electrons from contact regions, an excited state (ES) and a ground state (GS). As a first step we have calculated the densities of charge carriers in the 3 levels, and the densities of photons emitted during the RS-ES and ES-GS transitions by solving a system of differential equations. Then, we defined the energy bands and the wave functions of our structure, the confinement factor, the matrix element, and the gain as a function of x (fraction of InN), l the width of the quantum well and L the width of each barrier. Secondly we have examined the effect of external (injection current) and internal (quantum well width, barrier width and fraction) parameters on laser performance as confinement factor, photons and electrons’ densities, modal gain and output power.