title: Isotropic nonmagnetic flat cloaks degenerated from homogeneous anisotropic trapeziform cloaks.
abstract: We propose a novel kind of trapeziform cloak requiring only homogeneous anisotropic materials. Large-scale flat cloaks can be degenerated from the general trapeziform cloak with PEC inner boundary, and be realized by isotropic nonmagnetic materials for optical frequencies with controlled index profiles and improved invisibility. With the support of PEC inner boundary, large vehicles and objects of arbitrary shape can be concealed between the PEC and ground, and PEC can be firm by adding pillars in the cloaking space. Full-wave simulations validate the proposed cloaking concept, which is not only based on simple isotropic nonmagnetic materials but also realizable in practice.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge, Singapore 119620, Republic of Singapore.
authors.forename: Tiancheng
authors.initials: T
authors.lastname: Han
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Qiu