title: "Cloaking at a distance" from folded geometries in bipolar coordinates.
abstract: We propose a kind of folded geometry in bipolar coordinates. Transformation optics in such folded geometries has many intriguing applications, such as a kind of conceptual devices that can exactly cancel the scattering of a prespecified external object and thereby make it invisible. Numerical simulations are performed to confirm the properties.
authors.affiliation: Department of Physics, Soochow University, Suzhou, Jiangsu 215006, China.
authors.forename: Huanyang
authors.initials: H
authors.lastname: Chen
authors.forename: C T
authors.initials: CT
authors.lastname: Chan