Non-ideal cloaking based on Fabry-Perot resonances in single-layer high-index

A E Serebryannikov,Ekmel Ozbay,P V Usik

doi:10.1364/oe.17.016869

Abstract

Strong reduction of the scattering cross section is obtained for subwavelength dielectric and conducting cylinders without any magnetism for both TE and TM polarizations. The suggested approach is based on the use of Fabry-Perot type radial resonances, which can appear in single-layer, high-epsilon, isotropic, and homogeneous shells with the properly chosen parameters. Frequencies of the minima of the scattering cross section, which are associated with the cloaking, typically depend on whether TE or TM polarization is considered. In some cases, large-positive-epsilon and large-negative-epsilon objects can be cloaked. In other cases, non-ideal multifrequency cloaking can be realized.

Highlights

The theory and experimental verification of invisibility cloaks for dielectric and conducting objects have been the focus of interest for the last three years
It has been shown that the transformational optics approach does not require any magnetism, if magnetic field is polarized along the cloak axis [11]
We studied scattering of plane waves by dielectric and conducting cylinders, which are moderately or weakly subwavelength and coated with a single-layer high-ε dielectric shell

Summary

Introduction

The theory and experimental verification of invisibility cloaks for dielectric and conducting objects have been the focus of interest for the last three years. Several approaches have been suggested, which include those based on transformational optics [1,2,3], localized anomalous resonance [4,5], plasmonic cloaking [6,7], and transmission-line networks [8,9]. The possibility of a substantial reduction of the scattering cross section without magnetism is very intriguing, especially for optical cloaks. It has been shown that the transformational optics approach does not require any magnetism, if magnetic field is polarized along the cloak axis [11]. We will demonstrate the existence of the Fabry-Perot radial resonances in purely dielectric, isotropic, homogeneous, high-index, single-layer shells, and their potential in cloaking of dielectric and conducting objects. The emphasis will be put on the ranges of variation of frequency and permittivity of the coated cylinder, for which significant reduction of the scattering cross section can be achieved due to the coating

Background

Results and discussion

Conclusions