rXXXX American Chemical Society A dx.doi.org/10.1021/nl201189z |Nano Lett. XXXX, XXX, 000–000 LETTER pubs.acs.org/NanoLett A Carpet Cloak for Visible Light

Invisibility cloaks, a family of optical illusion devices that routeelectromagnetic (EM) waves around an object so that the existence of the object does not perturb light propagation, are still in their infancy. Artificially structured materials with engineered EM properties, known as metamaterials,1,2 have been used to control the propagation of EM waves. Metamaterials have been applied to cloaking using the transformation optics design methodology3 to control the propagation of optical48 and more recently plasmonic911 waves. The invariance of Maxwell’s equations under coordinate transformation3 allows the space around an object to be reshaped such that the light can propagate in the desired manner. Such transformations usually require EM properties with extreme values that are only achievable in metallic metamaterials and have been experimentally demon-strated for cloaking at microwave frequencies.12,13 Because of the significant metallic loss at optical frequencies, the implementa