Size-dependent intersubband optical properties of dome-shaped InAs/GaAs quantum dots with wetting layer

TL;DR

This study investigates how the size and wetting layer influence the electronic and optical properties of dome-shaped InAs/GaAs quantum dots, revealing size-dependent effects on absorption and refractive indices.

Contribution

It introduces a model considering size and wetting layer effects on quantum dot optical properties using the effective mass and density matrix formalisms.

Findings

Size significantly affects eigenenergies and absorption coefficients.

Wetting layer modifies the optical response of quantum dots.

The model predicts tunable optical properties based on quantum dot size.

Abstract

In this work, the effect of size and wetting layer on subband electronic envelop functions, eigenenergies, linear and nonlinear absorption coefficients and refractive indices of a dome-shaped InAs/GaAs quantum dot were investigated. In our model, a dome of InAs quantum dot with its wetting layer embedded in a GaAs matrix was considered. A finite height barrier potential at the InAs/GaAs interface was assumed. To calculate envelop functions and eigenenergies, the effective one electronic band Hamiltonian and electron effective mass approximation were used. The linear and nonlinear optical properties were calculated by the density matrix formalism.