Experimental Verification of 3D Plasmonic Cloaking in Free-Space

TL;DR

This paper experimentally demonstrates 3D plasmonic cloaking in free space by suppressing microwave scattering from a dielectric cylinder, validating the effectiveness of metamaterial cloaks through measurements, simulations, and analytical results.

Contribution

First experimental verification of 3D plasmonic cloaking for free-space objects using scattering cancellation techniques.

Findings

Effective scattering suppression around the object in near- and far-field

Validation of measurements with analytical and simulation results

Realization of robust plasmonic metamaterial cloaks for elongated 3D objects

Abstract

We report the experimental verification of metamaterial cloaking for a 3D object in free space. We apply the plasmonic cloaking technique, based on scattering cancellation, to suppress microwave scattering from a finite-length dielectric cylinder. We verify that scattering suppression is obtained all around the object in the near- and far-field and for different incidence angles, validating our measurements with analytical results and full-wave simulations. Our near-field and far-field measurements confirm that realistic and robust plasmonic metamaterial cloaks may be realized for elongated 3D objects with moderate transverse cross-section at microwave frequencies.