Title:
Plasmonic materials in transparency and cloaking problems: mechanism, robustness, and physical insights
Author(s):
Andrea Alù and Nader Engheta
Source:
OPTICS EXPRESS
Vol./Issue/Date:
19 March 2007 / Vol. 15, No. 6
Year:
2007
Page(s):
3318-3332
Keywords:
Abstract:
The possibility of making a given object transparent to the
impinging radiation, or cloaking it, by employing a suitable metamaterial or
plasmonic cover has been recently studied theoretically, showing how this
technique may overcome the limitations of other currently available
techniques. Here we discuss the underlying mechanisms, physical insights
and some computer simulations on the role of such homogeneous isotropic
metamaterial covers near their plasma frequency in order to dramatically
reduce the fields scattered by a given object. Not requiring any absorptive
process, any anisotropy or inhomogeneity, and any interference
cancellation, in this contribution we demonstrate, using full-wave numerical
simulations, how a homogeneous isotropic plasmonic material shell may
basically “re-route” the impinging field in such a way to make dielectric and
even conducting or metallic objects of a certain size nearly transparent to an
outside observer placed in its near as well as in its far field. In addition, it is
discussed in detail how this technique, relying on a non-resonant
phenomenon, is fairly robust to relatively high variations of the shape and of
the geometrical and electromagnetic properties of the cloaked object.
Document:
Reference Id:
283
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