Linear and nonlinear optical properties of multi-layered spherical nano-systems with donor impurity in the center

TL;DR

This paper investigates the linear and nonlinear optical absorption properties of multi-layered quantum dots and anti-dots with a central donor impurity, revealing how structural and intensity variations influence their optical responses.

Contribution

It provides analytical and numerical analysis of the optical absorption coefficients in multi-layered quantum nanostructures with impurity, highlighting the effects of structural parameters and incident intensity.

Findings

Absorption coefficients are significantly affected by optical intensity.

AC curves vary with photon energy and structural parameters.

Peak heights are sensitive to core radius and shell thickness in MLQAD.

Abstract

In this study, the linear, third-order nonlinear and total absorption coefficients (ACs) of multi-layered quantum dot (MLQD) and multi-layered quantum anti-dot (MLQAD) with a hydrogenic impurity are calculated. The analytical and numerical solutions of Schr\"{o}dinger equation for both MLQD and MLQAD, within the effective mass approximation and dielectric continuum model, are obtained. As our numerical results indicate, an increase in the optical intensity changes the total AC considerably, but the intensity range that leads to these changes is different for MLQAD and MLQD. It is observed that by changing the incident photon energy, the AC curves corresponding to MLQAD and MLQD are of different shapes and behaviors. The peak heights of AC curves corresponding to MLQAD are strongly affected by changing the core antidot radius and the shell thickness values, however in these cases no considerable changes are observed in peak heights of MLQD. Furthermore, in contrast to MLQAD, the photon energies corresponding to total AC peaks of MLQD are more affected by changing the confining potentials (CPs).