Metamaterials and camouflage

Abstract

The theory of optical invisibility camouflage, published in Science in 2006, has made remarkable progress in the last decade and produced various derived theories. In the first half of this paper, a flexible metamaterial device consisting of metal split rings embedded in a transparent polymer film is demonstrated. The device is useful for constructing three-dimensional metamaterial systems to develop novel photonic applications such as invisibility camouflage. In the latter half of this paper, the theory of asymmetric optical camouflage is also introduced. Asymmetric optical camouflage is a special cloak with unidirectional transparency; that is, a person in the cloak cannot be seen from the outside but is able to see outside.