Researchers at Duke University have developed a blueprint for an "invisibility cloak" that could be used in military applications and wireless communications. The design specifies the use of exotic, synthetic composites called metamaterials. According to Professor David R. Smith, "All light or other electromagnetic waves are swept around the area, guided by the metamaterial to emerge on the other side as if they had passed through an empty volume of space." The work was supported by the Defense Advanced Research Projects Agency (DARPA).