Transmission of a Symmetric Light Pulse through a Wide QW

TL;DR

This paper investigates how symmetric electromagnetic pulses interact with wide quantum wells, focusing on reflection, transmission, and absorption near interband transition frequencies, highlighting the effects of spatial dispersion and refractive index differences.

Contribution

It provides a theoretical analysis of pulse propagation through wide quantum wells, considering discrete energy levels and spatial dispersion effects, which is a novel approach.

Findings

Spatial dispersion increases reflection.

Refractive index differences significantly affect transmission.

Time-dependent reflection and absorption are characterized.

Abstract

The reflection, transmission and absorption of a symmetric electromagnetic pulse, which carrying frequency is close to the frequency of an interband transition in a QW (QW), are obtained. The energy levels of a QW are assumed discrete, one exited level is taken into account. The case of a wide QW is considered when a length of the pulse wave, appropriate to the carrying frequency, is comparable to the QW's width. In figures the time dependencies of the dimensionless reflection, absorption are transmission are represented. It is shown, that the spatial dispersion and a distinction in refraction indexes influence stronger reflection.