Intrasubband-related linear and nonlinear optical absorption in single, double and triple QW: the compositions, temperature and QW’s number effects

Abstract

ABSTRACT This paper exhibits a numerical simulation study of the 1s→2p ISB-related linear and nonlinear optical absorption in single, double, and triple QWs considering the effects of the compositions, temperature, and QW’s number. Our calculations were performed numerically as part of the effective mass approximation using finite element analysis. Our results reveal that for different nanostructures, optical absorption in quantum wells strongly depends on geometry, compositions, and temperature. Furthermore, we have found that optical absorption is greater and more sensitive to compositions and temperature variations in single QW than in double and triple QWs. In addition, a red-shift (blue-shift) associated with an enhancement (fall) of the resonance peaks of the optical absorption spectrum was obtained under the variation of composition, temperature, and number of QW per structure. However, we noticed that adding a QW causes a dramatic decrease in optical absorption due to the high loss rate due to oblique tunnelling and non-radiative optical transitions in double and multiple QWs compared to a single QW. We hope that this study will make a modest contribution to the field of theoretical and computational condensed matter physics.