title: Spherical cloaking using nonlinear transformations for improved segmentation into concentric isotropic coatings.
abstract: Two novel classes of spherical invisibility cloaks based on nonlinear transformation have been studied. The cloaking characteristics are presented by segmenting the nonlinear transformation based spherical cloak into concentric isotropic homogeneous coatings. Detailed investigations of the optimal discretization (e.g., thickness control of each layer, nonlinear factor, etc.) are presented for both linear and nonlinear spherical cloaks and their effects on invisibility performance are also discussed. The cloaking properties and our choice of optimal segmentation are verified by the numerical simulation of not only near-field electric-field distribution but also the far-field radar cross section (RCS).
authors: Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: Cheng-Wei
authors: CW
authors: Qiu
authors: Li
authors: L
authors: Hu
authors: Baile
authors: B
authors: Zhang
authors: Bae-Ian
authors: BI
authors: Wu
authors: Steven G
authors: SG
authors: Johnson
authors: John D
authors: JD
authors: Joannopoulos
mesh_terms: D016880:Anisotropy; D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D012637:Security Measures