Cloaking at Optical Frequencies

  • 22 April 2009
Abstract
The ability of rendering objects invisible using a cloak - not detectable by an external observer - for concealing objects has been a tantalizing goal. Here, we demonstrate a cloak operating in the optical regime. The cloak operates at a wide bandwidth and conceals a deformation on a flat reflecting surface, under which an object can be hidden. The device is composed of nanometer size silicon structures with spatially varying densities across the cloak. The density variation is defined using transformation optics to define the effective index distribution of the cloak.