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

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

2012-03-26

arxiv.org/abs/1203.5831v1

Journal of Applied Physics 111, 053105 (2012)

Physics

Optics

17 pages, 12 figures

Scientific paper

10.1063/1.3691242

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.

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