title: The anti-cloak.
abstract: A kind of transformation media, which we shall call the "anti-cloak", is proposed to partially defeat the cloaking effect of the invisibility cloak. An object with an outer shell of "anti-cloak" is visible to the outside if it is coated with the invisible cloak. Fourier-Bessel analysis confirms this finding by showing that external electromagnetic wave can penetrate into the interior of the invisibility cloak with the help of the anti-cloak.
authors.affiliation: Department of Physics, Shanghai Jiao Tong University, Shanghai, China. kenyon@ust.hk
authors.forename: Huanyang
authors.initials: H
authors.lastname: Chen
authors.forename: Xudong
authors.initials: X
authors.lastname: Luo
authors.forename: Hongru
authors.initials: H
authors.lastname: Ma
authors.forename: C T
authors.initials: CT
authors.lastname: Chan
mesh_terms: D003198:Computer Simulation; D008027:Light; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D012637:Security Measures