Abstract
•Optical properties of GaN/AlxGa1-xN CSQDS encapsulated with different matrices.•Dielectric function peak can experience a red or blue shift.•Intersubband transition.
In this research, the effective mass approximation (E.M.A) and the compact density matrix approach have been used to compute the energy eigenvalues, linear, nonlinear and total dielectric functions for GaN/AlxGa1-xN core/shell quantum dot (CSQD) encapsulated with three different matrices (PVA, PMMA and SiO2). The influence of the geometrical factor (core to shell radii ratio) on the electron spectrum and transition energy has been analyzed. Our theoretical investigation indicated that with the appropriate dielectric environment, peaks of the real and imaginary parts of the linear, nonlinear and total dielectric functions can be spectacularly enhanced and experience a red or a blue shift. These findings suggest the possibility of tuning the resonant peaks by using the combined effect of the spatial confinement and dielectric discontinuity between the dot and the surrounding medium which can be beneficial in many fields especially for optoelectronic device applications.