Sensitivity of the linear and nonlinear optical properties to electric field and doping density in CdSe/MgSe single quantum well

Abstract

Abstract In the present paper, we have explored the impact of doping concentration and applied electric field on both the linear and nonlinear optical properties based upon the intersubband transitions of CdSe/MgSe single quantum well (QWs) in the framework of the Effective Mass Approximation (EMA) using the compact density matrix approach. The energy levels and their relative wave functions are obtained by solving the coupled equations of Schrödinger-Poisson by the Finite Difference Method (FDM) under the envelope wave functions approximation. The third order nonlinear optical susceptibility, the refractive index change (RIC) and the absorption coefficient (AC) were investigated as a function of doping concentration. The numerical results revealed that the increase of the doping concentration ND blue shifts the peak position of the linear and nonlinear optical properties with a substantial enhancement of their magnitudes. The same behavior related to the third order nonlinear susceptibility was noted when the considered structure is undergone to an external electric field.