Electric field and shape effect on the linear and nonlinear optical properties of ellipsoidal finite-potential quantum dots

• Prolate shape red shifts the peak positions of ACs and RICs and weakens the ACs.
• Oblate shape blue shifts the peak positions ACs and RICs and enhances the ACs.
• Electric field red shifts the peak positions of ACs and RICs.
• The influence of nonlinear ACs is more pronounced for the oblate shape.

In this work, the optical properties of ellipsoidal finite-potential quantum dot with an on-center shallow hydrogenic impurity in the presence of an external electric field have been studied. A variational procedure in the framework of perturbation theory was employed within the effective-mass approximation. Numerical results on typical GaAs/AlxGa1−xAs materials show that, besides incident light intensity, the electric field and dot shape have an important influence on the peak positions and magnitudes of linear and third-order nonlinear absorption coefficients and refractive index changes.