Influence of Anomalous Dispersion on Optical Characteristics of Quantum Wells

TL;DR

This study investigates how anomalous dispersion affects the optical properties of quantum wells near interband resonances, considering magnetic fields and spatial dispersion, revealing that reflection is mainly influenced by anomalous dispersion while transmission and absorption are not.

Contribution

It introduces a detailed analysis of anomalous dispersion effects on quantum well optical characteristics near resonant transitions, accounting for magnetic fields and spatial dispersion effects.

Findings

Reflection coefficient near resonance is dominated by anomalous dispersion curves.

Transmission and absorption do not exhibit similar anomalous dispersion dependencies.

Large radiative lifetimes enhance the influence of anomalous dispersion on reflection.

Abstract

Frequency dependencies of optical characteristics (reflection, transmission and absorption of light) of a quantum well are investigated in a vicinity of interband resonant transitions in a case of two closely located excited energy levels. A wide quantum well in a quantizing magnetic field directed normally to the quantum-well plane, and monochromatic stimulating light are considered. Distinctions between refraction coefficients of barriers and quantum well, and a spatial dispersion of the light wave are taken into account. It is shown that at large radiative lifetimes of excited states in comparison with nonradiative lifetimes, the frequency dependence of the light reflection coefficient in the vicinity of resonant interband transitions is defined basically by a curve, similar to the curve of the anomalous dispersion of the refraction coefficient. The contribution of this curve weakens at alignment of radiative and nonradiative times, it is practically imperceptible at opposite ratio of lifetimes . It is shown also that the frequency dependencies similar to the anomalous dispersion do not arise in transmission and absorption coefficients.