Invisibility and supervisibility: Radiation dynamics in a discrete electromagnetic cloak

Electromagnetic detection of a perfect invisibility cloak.

A perfect invisibility cloak is commonly believed to be undetectable from electromagnetic (EM) detection because it is equivalent to a curved but empty EM space created from coordinate transformation. Based on the intrinsic asymmetry of coordinate transformation applied to motions of photons and charges, we propose a method to detect this curved EM space by shooting a fast-moving charged partic...

Electromagnetic forces on a discrete spherical invisibility cloak under time-harmonic illumination.

We study electromagnetic forces and torques on a discrete spherical invisibility cloak under time-harmonic illumination. We consider the influence of material absorption and losses, and we show that while the impact of absorption on the optical force remains confined to frequencies near the absorption peak, its impact on the electromagnetic torque experienced by the cloak is spectrally broader ...

Title Electromagnetic detection of a perfect invisibility cloak

Invisibility cloak without singularity

An elliptical invisible cloak is proposed using a coordinate transformation in the ellipticalcylindrical coordinate system, which crushes the cloaked object to a line segment instead of a point. The elliptical cloak is reduced to a nearly-circular cloak if the elliptical focus becomes very small. The advantage of the proposed invisibility cloak is that none of the parameters is singular and the...

Optical Cloak of Invisibility

We present the design and analysis of an optical cloak of invisibility with non-magnetic metamaterials. The general recipe for the implementation of such a device is provided. The cloaking performance is illustrated with finite-element simulations. ©2007 Optical Society of America OCIS codes: (230.3990) Microstructure devices; (160.4760) Optical properties; (999.9999) Meta-materials