Abstract
In this paper, we demonstrate the relation between cloaking effect and its nonradiating state by considering the destructive multipolar interaction between near-field scattering by bare object and surrounding coating located in its proximity. This cloaking effect is underpinned by anapole mode excitation and it occurs as destructive interference between the electric dipole moment, generated by a bare object (here a central metallic scatterer) and the toroidal moment, formed inside the cloak (a surrounding cluster of dielectric cylinders). Numerical results show how a cloaking effect based on the formation of the anapole mode can lead to an overall nonradiating metamolecule with all-dielectric materials in the coating region.
Highlights
In this paper, we demonstrate the relation between cloaking effect and its nonradiating state by considering the destructive multipolar interaction between near-field scattering by bare object and surrounding coating located in its proximity
We demonstrate for the first time the relation between nonradiating states named as anapoles[6,7,8,37] and the cloaking effect based on the multipolar interactions between the object to be hidden and the coating around it
Our purpose in the present paper is to find a surrounding cloak with purely toroidal moment T that, together with the dipole moment P of the bare scattering object, creates a nonradiating state, which is by definition an anapole mode[5,6,7,8]
Summary
We demonstrate the relation between cloaking effect and its nonradiating state by considering the destructive multipolar interaction between near-field scattering by bare object and surrounding coating located in its proximity. Pioneering works on invisible bodies and transparent objects have strongly contributed to the concept of electromagnetic invisibility[1,2,3,4], that has passed from science fiction to science in the last decade with the excitation of nonradiating states[5,6,7,8] and the introduction of cloaking devices[9,10,11,12,13,14] Other techniques such as (i) camouflaging, popular for military purposes, have been explored by shaping the object’s contour with different designs and (ii) acoustic/thermal footprint reduction approaches[15,16], with the consequent redirection or the absorption of the impinging vector/scalar field. A growing number of research efforts has been performed towards new types of improved covers with better transmission and/or reflection properties, miniaturized sizes or increased operational bandwidth[36], just to mention some of the most challenging aspects of this contemporary research area
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