Electromagnetic cloaking of cylindrical objects by multilayer or uniform dielectric claddings

TL;DR

This paper demonstrates that cylindrical objects, including perfect conductors, can be effectively cloaked using simple multilayer or uniform dielectric coverings without exotic materials, supported by analytical models and numerical simulations.

Contribution

It introduces a straightforward analytical approach for dielectric cloaking of cylinders, extending previous numerical results to a rigorous theoretical framework.

Findings

Dielectric cloaking works for perfect conductors and cylinders.

Analytical models match numerical simulations accurately.

Uniform dielectric layers can achieve effective cloaking.

Abstract

We show that dielectric or even perfectly conducting cylinders can be cloaked by a uniform or a layered dielectric cladding, without the need of any exotic or magnetic material parameters. In particular, we start by presenting a simple analytical concept that can accurately describe the cloaking effect obtained with conical silver plates in the visible spectrum. The modeled structure has been originally presented in [S. A. Tretyakov, P. Alitalo, O. Luukkonen, C. R. Simovski, Phys. Rev. Lett., vol. 103, p. 103905, 2009], where its operation as a cloak in the optical frequencies was studied only numerically. We model rigorously this configuration as a multi-layer dielectric cover surrounding the cloaked object, with excellent agreement to the simulation results of the actual device. The concept of using uniform or multilayer dielectric covers, with relative permittivities larger than unity, is then successfully extended to cloaking of impenetrable objects such as conducting cylinders.