Inverse problems, invisibility, and artificial wormholes

We will describe recent theoretical and experimental progress on making objects invisible to electromagnetic waves. Maxwell's equations have transformation laws that allow for design of electromagnetic parameters that would steer light around a hidden region, returning it to its original path on the far side. Not only would observers be unaware of the contents of the hidden region, they would not even be aware that something was hidden. The object would have no shadow. New advances in metamaterials have given some experimental evidence that this indeed can be made possible at certain frequencies.

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