Electromagnetically induced invisibility cloaking

TL;DR

This paper demonstrates a novel approach to optical cloaking using electromagnetically induced transparency in atomic vapours or solids, enabling partial invisibility with simpler materials than traditional metamaterials.

Contribution

It introduces a new method for cloaking based on electromagnetically induced transparency and chiral media, simplifying the realization of optical cloaks.

Findings

Achieved partial carpet cloaking at optical frequencies.

Used chiral media with magneto-electrical cross-coupling to modify refractive index.

Calculated parameters for constructing a cloak with gradient magnetic fields.

Abstract

Invisibility cloaking imposes strict conditions on the refractive index profiles of cloaking media that must be satisfied to successfully hide an object. The first experimental demonstrations of cloaking used artificial metamaterials to respond to this challenge. In this work we show how a much simpler technique of electromagnetically induced transparency can be used to achieve a partial, {\it carpet} cloaking at optical frequencies in atomic vapours or solids. To generate a desired combination of low absorption with strong modifications of the refractive index, we use chiral media with an induced magneto-electrical cross-coupling. We demonstrate that high-contrast positive refractive indices can be attained by fine tuning the material with a gradient magnetic field and calculate the parameters required to construct a carpet cloak.