AAWSAP DIRD, Invisibility Cloaking Theory and Experiments, March 2010

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Summary
A cloaking device is a passive device made of a transparent material that guides light
around any object in its interior as if the light has passed through empty space. The
cloaking device conceals the object and hides the act of hiding itself. Perfect cloaking
devices are impossible because they require materials where the speed of light
approaches infinity. Imperfect cloaking devices could be made. Such devices implement
suitable curved-space geometries. For electromagnetic microwaves, cloaking devices
are definitely within reach of the present technology. Whether invisibility in the visible
range of t he spectrum will become a reality is not entirely clear yet. Most probably, this
will depend more on the new theoretical research than on advances in new materials,
and on the application of mathematical intelligence, intuition, and imagination.
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