ABSTRACT
During the last decade, research groups from all over the world have
demonstrated the possibilities offered by metamaterials, thanks
to their ability to control electromagnetic waves (and other types
of waves, for example, acoustic and elastic). Following the advent
of negative refraction and subwavelength imaging, it has proved
possible to hide some objects from electromagnetic radiation and
make them invisible. A first path to invisibility was investigated by
Engheta and Alu` [1] in 2005 and is based on plasmonic materials
designed to cloak dielectric or conducting objects. This technique
relies heavily on a scattering cancellation phenomenon, based on
the negative local polarizability of a cover made of low-electric-
permittivity materials. It appears to be relatively robust to changes
in the design parameters, geometry, and frequency of operation.
