Effect of size and composition on the third order nonlinear optical susceptibility for GaN/InxGa1-xN spherical core/shell quantum dot

Abstract

In this report, we have theoretically described, analyzed, and investigated the nonlinear optical properties in the core/shell nanostructure of GaN core surrounded by InxGa1−xN shell. Taking in consideration the effective-mass formalism, electron eigenenergies and corresponding wave functions were calculated. Employing the compact density matrix method, highlight quantities namely the third-order nonlinear susceptibility associated with intersubband transition is numerically computed and discussed as a function of CSQD radii and indium (In) composition. Our simulations have revealed the tunability of the position and the magnitude of the resonance peaks by adjusting the geometrical parameters and the indium ratio. The magnitude of both real and imaginary parts of the susceptibility is remarkably aroused and the peaks are red shifted with the rise of core/shell radii.