The nonlinear optical properties of "12-6" tuned GaAs/GaAlAs double quantum well under the external fields

Abstract

We have studied the linear and nonlinear optical properties of 12-6GaAs/Ga1-xAlxAs double quantum well heterostructure under different external fields’ effects such as electric, magnetic and intense laser fields. We also investigated the effects of the variations of well width and aluminum concentration on the optical response of the structure under zero external field. Within the framework of effective mass and parabolic band approach, the time-independent Schrödinger equation has been solved numerically to obtain energy levels and the corresponding wave functions of the heterostructure by using the diagonalization method. The linear and nonlinear optical properties’ expressions have been calculated with the help of the compact density matrix method. According to our numerical results, we obtain a blue (red) shift of the resonant peaks belonging to the total optical absorption coefficients and the refractive index change with increasing applied external fields (the width of the well and aluminum concentration).