On some constraints that limit the design of an invisibility cloak

Details On some constraints that limit the design of an invisibility cloak On some constraints that limit the design of an invisibility cloak

2007-07-08

arxiv.org/abs/0707.1126v2

Phys. Rev. B 76, 241104(R) (2007)

Physics

Optics

Scientific paper

10.1103/PhysRevB.76.241104

Using the idea of transformation medium, a cloak can be designed to make a domain invisible for one target frequency. In this article, we examine the possibility to extend the bandwidth of such a cloak. We obtained a constraint of the band width, which is summarized as a simple inequality that states that limits the bandwidth of operation. The constraint originates from causality requirements. We suggest a simple strategy that can get around the constraint.

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