Isotropic-medium three-dimensional cloaks for acoustic and electromagnetic waves
arXiv:1203.5831 · doi:10.1063/1.3691242
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.
17 pages, 12 figures
References in corpus (9)
- Hiding Under the Carpet: a New Strategy for Cloaking
- Broadband Acoustic Cloak for Ultrasound Waves
- A complementary media invisibility cloak that can cloak objects at a distance outside the cloaking shell
- Acoustic cloaking theory
- Notes on Conformal Invisibility Devices
- Approaches to Three-Dimensional Transformation Optical Media Using Quasi-Conformal Coordinate Transformations
- Isotropic transformation optics: approximate acoustic and quantum cloaking
- Transformation Optics with Photonic Band Gap Media
- Invisibility cloaking without superluminal propagation