Extremely Thin Dielectric Metasurface for Carpet Cloaking

TL;DR

This paper presents an ultra-thin dielectric metasurface that effectively cloaks objects on a ground plane by reshaping wavefronts, demonstrated through microwave simulations and applicable across a wide frequency range.

Contribution

The authors introduce a novel, extremely thin dielectric metasurface for carpet cloaking, utilizing a graded phase gradient to achieve wavefront shaping and cloaking at microwave frequencies.

Findings

Successful design and simulation of a bb/12 thickness dielectric metasurface

Effective cloaking demonstrated through full-wave simulations

Potential for application at near-infrared frequencies

Abstract

We demonstrate a novel and simple approach to cloaking a scatterer on a ground plane. We use an extremely thin dielectric metasurface ({\lambda}/12) to reshape the wavefronts distorted by a scatterer in order to mimic the reflection pattern of a flat ground plane. To achieve such carpet cloaking, the reflection angle has to be equal to the incident angle everywhere on the scatterer. We use a graded metasurface and calculate the required phase gradient to achieve cloaking. Our metasurface locally provides additional phase to the wavefronts to compensate for the phase difference amongst light paths induced by the geometrical distortion. We design our metasurface in the microwave range using highly sub-wavelength dielectric resonators. We verify our design by full-wave time-domain simulations using micro-structured resonators and show that results match theory very well. This approach can be applied to hide any scatterer on a ground plane not only at microwave frequencies, but also at higher frequencies up to the near infrared.