A Radial-Dependent Dispersive Finite-Difference Time-Domain Method for the Evaluation of Electromagnetic Cloaks
Christos Argyropoulos, Yan Zhao, Yang Hao
TL;DR
This paper introduces a radial-dependent dispersive FDTD method for simulating electromagnetic cloaks, revealing that perfect invisibility is limited to lossless materials and narrow frequency ranges.
Contribution
The paper develops a novel FDTD simulation approach incorporating radial-dependent dispersion for electromagnetic cloaks.
Findings
Perfect invisibility requires lossless metamaterials.
Invisibility bandwidth is extremely narrow.
Lossy materials significantly reduce cloaking effectiveness.
Abstract
A radial-dependent dispersive finite-difference time-domain (FDTD) method is proposed to simulate electromagnetic cloaking devices. The Drude dispersion model is applied to model the electromagnetic characteristics of the cloaking medium. Both lossless and lossy cloaking materials are examined and their operating bandwidth is also investigated. It is demonstrated that the perfect "invisibility" from electromagnetic cloaks is only available for lossless metamaterials and within an extremely narrow frequency band.
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