Open AccessAchieving invisibility over a finite range of frequencies
Author(s) -
Mohamed Farhat,
Sébastien Guenneau,
A. B. Movchan,
Stéfan Enoch
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.005656
Subject(s) - cloaking , cloak , optics , metamaterial , physics , wavelength , homogenization (climate) , permittivity , transverse plane , negative refraction , electromagnetic radiation , dielectric , optoelectronics , biodiversity , ecology , structural engineering , biology , engineering
We analyze cloaking of transverse electric (TE) fields through homogenization of radially symmetric metallic structures. The two-dimensional circular cloak consists of concentric layers cut into a large number of small infinitely conducting sectors which is equivalent to a highly anisotropic permittivity. We find that a wave radiated by a magnetic line current source located a couple of wavelengths away from the cloak is almost unperturbed in magnitude but not in phase. Our structured cloak is shown to work for different wavelengths provided they are ten times larger than the outermost sectors.