The effects of the intense laser field on the nonlinear optical properties of a cylindrical Ga1−xAlxAs/GaAs quantum dot under applied electric field

• The effects of the non-resonant intense laser field and electric field on the nonlinear optical properties of cylindrical quantum dot are investigated.
• The both total absorption coefficient and refractive index change are sensitive to dot dimensions and the effects of external fields.
• By changing the external fields together with dot dimensions a blue or red shift can be obtained.

In the present work, the effects of the intense laser field on total optical absorption coefficient (the linear and third-order nonlinear) and total refractive index change (the linear and third-order nonlinear) for transitions between different intersubbands in the Ga1−xAlxAs/GaAs cylindrical quantum dot under external electric field are investigated. The calculations were performed within the compact density-matrix formalism with the use of the effective mass approximation. The obtained results show that both total absorption coefficient and refractive index change are sensitive to the electric and intense laser fields. By changing the intensities of the electric and laser fields, we can obtain the blue or red shift, without the need for the growth of many different samples.