Optimization of optical absorption coefficient in double modified Pöschl–Teller quantum wells

In this work, the intersubband optical absorption coefficient in double quantum wells (QWs) represented by a modified Pöschl–Teller confining potential is optimized. This potential is well suited for such purposes as it can easily become asymmetrical by a correct choice of its parameters set. By using the particle swarm optimization algorithm and numerical solution of the Schrödinger equation, accompanied with the perturbation theory, we found the optimal structure that the optical absorption coefficient is maximum. Applying this algorithm to double modified Pöschl–Teller QWs structure shows that the total optical absorption coefficient for this structure is 1.22×106m-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1.22\times 10^6\, \hbox {m}^{-1}$$\end{document}. Then, the refractive index changes is investigated by using the density matrix method.