Full three-dimensional broadband and isotropic carpet cloak

Abstract

This paper presents a full three-dimensional carpet cloak design, whose invisibility is independent of the incident wave direction. The device is developed with transformation optics and three-dimensional quasi-conformal coordinate transformation, which is obtained through parametrization and numerical optimization. The anisotropy reduction was sufficient to consider the medium as isotropic and to achieve the invisibility effect. The used technique enables to design the carpet cloak in broadband range and independently of light polarization.