title: Broadband invisibility by non-Euclidean cloaking.
abstract: Invisibility and negative refraction are both applications of transformation optics where the material of a device performs a coordinate transformation for electromagnetic fields. The device creates the illusion that light propagates through empty flat space, whereas in physical space, light is bent around a hidden interior or seems to run backward in space or time. All of the previous proposals for invisibility require materials with extreme properties. Here we show that transformation optics of a curved, non-Euclidean space (such as the surface of a virtual sphere) relax these requirements and can lead to invisibility in a broad band of the spectrum.
authors.affiliation: Physics Department, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore. ulf@st-andrews.ac.uk
authors.forename: Ulf
authors.initials: U
authors.lastname: Leonhardt
authors.forename: Tomás
authors.initials: T
authors.lastname: Tyc