Wave Scattering by a Cylindrical Metasurface Cavity of Arbitrary Cross-Section: Theory and Applications

TL;DR

This paper develops a combined integral equation and GSTC-based method to analyze electromagnetic scattering by arbitrarily shaped cylindrical metasurfaces, demonstrating cloaking and illusion effects with both active and passive designs.

Contribution

It introduces a novel technique integrating IE and GSTCs with bianisotropic tensors for arbitrary cylindrical metasurfaces, enabling accurate scattering analysis and practical cloaking applications.

Findings

Active metasurfaces achieve perfect cloaking and eliminate scattering.

Passive metasurfaces significantly reduce extinction cross section.

The method is validated through cloaking and illusion optics examples.

Abstract

This paper presents a technique, combining the integral equations (IE) and the Generalized Sheet Transition Conditions (GSTCs) with bianisotropic susceptibility tensors, to compute electromagnetic wave scattering by cylindrical metasurfaces -- forming two-dimensional porous cavities -- of arbitrary cross sections. Moreover, it applies this technique to two problems -- cloaking with circular and rhombic shapes and illusion optics with an elliptic shape -- that both validate it, from comparison with specifications used in an exact synthesis of the metasurfaces, and reveal interesting capabilities of such metasurface structures. Particularly, active cylindrical metasurfaces can perfectly cloak and hence eliminate the extinction cross section of various cylindrical shapes, and simple purely passive versions of them, practically more accessible, still perform quite good cloaking and provide remakable extinction cross section reduction.