Analytical study of spherical cloak/anti-cloak interactions

  • Castaldi G
  • Gallina I
  • Galdi V
 et al. 
  • 19


    Mendeley users who have this article in their library.
  • 15


    Citations of this article.


The intriguing concept of "anti-cloaking" has been recently introduced within the framework of transformation optics (TO), first as a "countermeasure" to invisibility-cloaking (i.e., to restore the scattering response of a cloaked target), and more recently in connection with "sensor invisibility" (i.e., to strongly reduce the scattering response while maintaining the field-sensing capabilities). In this paper, we extend our previous studies, which were limited to a two-dimensional cylindrical scenario, to the three-dimensional spherical case. More specifically, via a generalized (coordinate-mapped) Mie-series approach, we derive a general analytical full-wave solution pertaining to plane-wave-excited configurations featuring a spherical object surrounded by a TO-based invisibility cloak coupled via a vacuum layer to an anti-cloak, and explore the various interactions of interest. With a number of selected examples, we illustrate the cloaking and field-restoring capabilities of various configurations, highlighting similarities and differences with respect to the cylindrical case, with special emphasis on sensor-cloaking scenarios and ideas for approximate implementations that require the use of double-positive media only. © 2011 Elsevier B.V.

Author-supplied keywords

  • Anti-cloaking
  • Cloaking
  • Metamaterials
  • Transformation optics

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Giuseppe Castaldi

  • Ilaria Gallina

  • Vincenzo Galdi

  • Andrea Alù

  • Nader Engheta

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free