Spherical cloaking using nonlinear transformations for improved segmentation into concentric isotropic coatings

• Main Authors: Hu, Li (Author), Zhang, Baile (Contributor), Wu, Bae-Ian (Contributor), Qiu, Cheng-Wei (Contributor), Johnson, Steven G (Author), Joannopoulos, John (Author)
• Other Authors: Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Contributor), Massachusetts Institute of Technology. Department of Mathematics (Contributor), Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor), Johnson, Steven G. (Contributor), Joannopoulos, John D. (Contributor)
• Format: Article
• Language: English
• Published: Optical Society of America, 2013-09-23T14:12:30Z.
• Subjects: Article
• Online Access: Get fulltext

 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).