Department of Mathematics Colloquium
|We present a way of using active sources to
hide objects from a known incident field. The active sources cancel out
the incident field in a region while having a small far field. Since
very little waves reach objects in the cloaked region, the scattered
field is greatly diminished, making the object practically invisible.
We recall how to construct such a cloak using a single and double layer
potential on a surface (Green's formulas) and then show how the same
effect can be achieved using a few multipolar sources that do not
completely surround the cloaked region.