Cylindrical Cloak with Axial Permittivity/Permeability Spatially Invariant

TL;DR

This paper proposes a simplified cylindrical invisibility cloak with invariant axial parameters, enabling easier experimental realization while maintaining high invisibility performance through 2D metamaterials.

Contribution

It introduces a perfect cylindrical cloak with spatially invariant axial parameters, simplifying fabrication and preserving effectiveness compared to traditional designs.

Findings

Invariance of axial parameters facilitates 2D metamaterial implementation.

Perturbation analysis shows robustness of the cloak's performance.

Quantitative scattering analysis confirms high invisibility performance.

Abstract

In order to reduce the difficulties in the experimental realizations of the cloak but still keep good performance of invisibility, we proposed a perfect cylindrical invisibility cloak with spatially invariant axial material parameters. The advantage of this kind of TE (or TM) cloak is that only rho and phi components of mu (or epsilon) are spatially variant, which makes it possible to realize perfect invisibility with two-dimensional (2D) magnetic (or electric) metamaterials. The effects of perturbations of the parameters on the performance of this cloak are quantitatively analyzed by scattering theory. Our work provides a simple and feasible solution to the experimental realization of cloaks with ideal parameters.