Isotropic-medium three-dimensional cloaks for acoustic and electromagnetic waves

TitleIsotropic-medium three-dimensional cloaks for acoustic and electromagnetic waves
Publication TypeJournal Article
Year of Publication2012
AuthorsY. Urzhumov, N.. Landy, D.R. Smith
JournalJournal of Applied Physics
Volume111
Issue5
Pagination053105
Date Published2012
Abstract

We propose a generalization of the two-dimensional eikonal-limit cloak derived from a conformal transformation to three dimensions. The proposed cloak is a spherical shell composed of only isotropic media; it operates in the transmission mode and requires no mirror or ground plane. Unlike the well-known omnidirectional spherical cloaks, it may reduce visibility of an arbitrary object only for a very limited range of observation angles. In the short-wavelength limit, this cloaking structure restores not only the trajectories of incident rays, but also their phase, which is a necessary ingredient to complete invisibility. Both scalar-wave (acoustic) and transverse vector-wave (electromagnetic) versions are presented.

Short TitleJ. Appl. Phys.