Cylindrical cloaking at oblique incidence with optimized finite multilayer parameters

TL;DR

This paper introduces multilayer cylindrical cloaks optimized for oblique incident angles, significantly reducing scattering across various angles using minimal layers and realistic material parameters.

Contribution

It presents a novel optimization method combining analytic scattering formalism and genetic algorithms for designing efficient multilayer cloaks for oblique incidence.

Findings

Two orders of magnitude reduction in scattering at optimized angles

Effective cloaking over a wide range of incident angles

Uses only four layers of practical metamaterials

Abstract

We propose multilayer cylindrical invisibility cloaks that are optimized for oblique incidences through combination of analytic formalism of scattering and genetic optimization. We show that by using only four layers of homogeneous and anisotropic metamaterials without large values of constitutive parameters, the scattering for oblique incidences can be reduced by two orders. Although the optimization is done at a single incident angle, the cloak provides reduced scattering over a large range of incident angles.