Cloaking dielectric spherical objects by a shell of metallic nanoparticles

TL;DR

This paper demonstrates a method to cloak dielectric spheres using a shell of metallic nanoparticles, effectively reducing their scattering signals by over 70% at specific wavelengths through an analytically designed and numerically validated approach.

Contribution

It introduces a novel cloaking technique using amorphously arranged metallic nanoparticles with tunable properties, supported by analytical modeling and numerical validation.

Findings

Over 70% scattering suppression at the design wavelength

Analytical model for cloak design provided

Numerical validation confirms cloak effectiveness

Abstract

We show that dielectric spheres can be cloaked by a shell of amorphously arranged metallic nanoparticles. The shell represents an artificial medium with tunable effective properties that can be adjusted such that the scattered signals of shell and sphere almost cancel each other. We provide an analytical model for the cloak design and prove numerically that the cloak operates as desired. We show that more than 70% of the scattered signal of the sphere can be suppressed at the design wavelength. Advantages and disadvantages of such a cloak when compared to other implementations are disclosed.