Abstract
Advances in designing and fabricating metamaterials with unique electromagnetic
properties have made it possible to raise the question of whether it is possible to
create invisible objects. A review was presented earlier of papers on the problem of
creating invisible objects whose size is less than or of the order of the wavelength
of electromagnetic radiation. This paper presents the second part of the review and
is concerned with the problem of creating invisible shells of arbitrary shape that
conceal the objects contained in them from an external observer. The results of a
theoretical prediction of the structure of such shells are described, based on the
method of spatial transformations. Theoretical approaches to the simplification of
the structure of the shells and attempts to experimentally implement the simplified
shells are presented. The appearance of a new specialization of theoretical
optics--transformation optics--is pointed out.
© 2009 Optical Society of America
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