Abstract

The combination of transformation optics [1,2] and metamaterials [3,4] was one of the groundbraking ideas of the last decade. It has generated a novel formalism to design devices that control the properties of light up to a unprecedented level [5]. The first device that was designed within the formalism of transformation optics was the invisibility cloak. An invisibility cloak turns a finite region in space invisible by guiding light around it. For an ideal cloak, it is impossible for light of any wavelength to enter the cloaked region. But if no light can go in, then perhaps no light can go out? This idea suggests that one could approach an invisibility cloak as an optical cavity.

© 2011 IEEE