A route to quasi-perfect invisibility cylindrical cloaks without extreme values in the parameters

TL;DR

This paper introduces an analytical model for multilayered cylindrical cloaks that achieves quasi-perfect invisibility with minimal scattering, using only a few layers of manageable anisotropic metamaterials without extreme parameter values.

Contribution

The authors develop a practical analytical model enabling the design of multilayered cloaks with low scattering and realistic material parameters, bypassing the need for extreme values in transformation-based methods.

Findings

Achieves quasi-perfect invisibility with few layers

Uses small, feasible permittivity and permeability parameters

Reduces intrinsic scattering in multilayered cloaks

Abstract

The method of coordinate transformation offers a way to realize perfect cloaks, but provides less ability to characterize the performance of a multilayered cloak in practice. Here, we propose an analytical model to predict the performance of a multilayered cylindrical cloak, based on which, the cloak in practice can be optimized to diminish the intrinsic scatterings caused by discretization and simplification. Extremely low scattering or "quasi-perfect invisibility" can be achieved with only a few layers of anisotropic metamaterials without following the transformation method. Meanwhile, the permittivity and permeability parameters of the layers are relatively small, which is a remarkable advantage of our approach.