Special frequencies in reflection spectra of Bragg multiple quantum well structures

TL;DR

This paper provides a theoretical analysis of reflection spectra in Bragg multiple quantum well structures, identifying special frequencies where reflection is minimally affected by quantum well number and damping effects.

Contribution

It offers an analytical explanation for the existence of multiple special frequencies in the spectra and examines the impact of dielectric contrast and exciton damping.

Findings

Identification of two special frequencies with weak dependence on quantum well number

Discovery of a third special frequency due to dielectric contrast and exciton resonance compensation

Analysis of how nonradiative damping influences reflection spectra

Abstract

We have studied theoretically optical reflection spectra from the Bragg multiple quantum well structures. We give an analytical explanation of the presence of two special frequencies in the spectra at which the reflection coefficient weakly depends on the quantum well number. The influence of the exciton nonradiative damping on the reflection spectra has been analyzed. It has been shown that allowance for the dielectric contrast gives rise to the third special frequency at which the contributions to the reflectivity related to the dielectric contrast and the exciton resonance mutually compensate one another.