SCATTERING CANCELLATION APPROACH TO CLOAKING: ACTUAL IMPLEMENTATION AND RECENT ADVANCEMENTS

In this chapter, we review the theoretical analysis and the design principles of electromagnetic cloaking devices working both at microwaves and optical frequencies. The cloaking approach we use is based on the scattering cancellation principle, applied not only to canonical geometries but also to irregularly-shaped objects with anisotropic scattering response. The cloaking devices are synthesized through plasmonic or metamaterials conformal covers, coating a given object, providing a significant and uniform scattering reduction of the overall structure, independent of the angle of incidence, position and polarization of the illuminating electromagnetic radiation. The robustness of the invisibility cloak is also discussed, proposing a proper figure of merit and validating the theoretical formulation and the design procedure through full-wave numerical simulations. The simulation results confirm that the plasmonic cloaking technique may be effectively applied to highly reduce the scattered field of even strongly anisotropic dielectric, plasmonic or conducting objects.