|Title||Construction of invisibility cloaks of arbitrary shape and size using planar layers of metamaterials|
|Publication Type||Journal Article|
|Year of Publication||2012|
|Authors||O. Paul, Y. Urzhumov, C. Elsen, D.R. Smith, M. Rahm|
|Journal||Journal of Applied Physics|
Transformation optics (TO) is a powerful tool for the design of electromagnetic and optical devices with novel functionality derived from the unusual properties of the transformation media. In general, the fabrication of TO media is challenging, requiring spatially varying material properties with anisotropic electric and magnetic responses. Though metamaterials have been proposed as a path for achieving such complex media, the required properties arising from the most general transformations remain elusive, and can be difficult to implement with traditional fabrication techniques. The authors propose faceted approximations of TO media of arbitrary shape in which the volume of the TO device is divided into flat metamaterial layers. These layers can be readily implemented by standard fabrication and stacking techniques. The approximation is illustrated with the specific example of a two-dimensional, omnidirectional invisibility cloak, whose performance is quantified using the total scattering cross-section as a practical figure of merit.
|Short Title||J. Appl. Phys.|