Frequency shifts of radiating particle moving in EIT metamaterial

TL;DR

This paper investigates how electromagnetically induced transparency (EIT) in metamaterials affects the frequency shifts of moving radiating particles, revealing conditions where radiation emission is suppressed and demonstrating control over Doppler effects.

Contribution

It introduces a theoretical and numerical analysis of Doppler shifts in EIT metamaterials, showing how transparency windows influence radiation and frequency shifts.

Findings

Doppler shift depends on source frequency and velocity in EIT metamaterials.

Transparency windows can suppress radiation emission at certain velocities.

Numerical simulations confirm analytical predictions.

Abstract

Nowadays, there is considerable interest in metamaterials which realize the electromagnetically induced transparency in a classical system. We consider the frequency shifts of particle moving in metamaterials exhibiting electromagnetically induced transparency effect. The dramatic change of the material dispersion due to the EIT influences the conditions for signal propagation in the medium and has a significant impact on the Doppler effect, possibly leading to the optical control over this phenomenon. The dependence of the Doppler shift to the source frequency and velocity and radiation spectra on external parameters is examined. It was found that for source frequencies fitting transparency window for particular range of source velocities cutoffs appear, i.e. the radiation is not emitted. Our theoretical findings are proved analytically and confirmed by numerical simulations based on finite-difference time-domain method.