Abstract

In present work, we theoretically study both the linear and the nonlinear absorption coefficient and refractive index related to the 1s-1p transition of a donor impurity in an AlAs/GaAs cylindrical core-shell quantum dot. Computations were carried out within the effective mass approximation employing a variational approach. It has been observed that optical responses of the core-shell quantum dot can be sensitively varied by changing shell thickness, impurity position, temperature, and pressure. Moreover, the absorption spectra reveals a large blue shift for the narrow shell width. The understanding of the optical transitions between the ground state (1s) and the first excited state (1p) in the structure can be applied for desirable features in nonlinear optics.