Electromagnetic detection of a perfect invisibility cloak.

Title Electromagnetic detection of a perfect invisibility cloak

Electromagnetic Detection of a Perfect Carpet Cloak

It has been shown that a spherical invisibility cloak originally proposed by Pendry et al. can be electromagnetically detected by shooting a charged particle through it, whose underlying mechanism stems from the asymmetry of transformation optics applied to motions of photons and charges [PRL 103, 243901 (2009)]. However, the conceptual three-dimensional invisibility cloak that exactly follows ...

Detecting the existence of an invisibility cloak using temporal steering

An invisibility cloak provides a way to hide an object under the detection of waves. A good cloak guides the incident waves through the cloaking shell with few distortion. Even if one day a nearly perfect cloak is built, some important quantum effects, such as dephasing of the electron spin or photon polarization, may still remain. In this work, we consider the possibility that using the tempor...

Got 15 minutes? Invisibility cloak coming up

(Phys.org) —Researchers have discovered an alternative way to make an invisibility cloak that departs from other attempts to do so. Attempts in the past have been via metamaterials, created by assembling structures that interact with the light they will cloak. Metamaterials are far from perfect, are expensive, and are time-consuming, so the research team, from Zhejiang University in China, the ...

Perfect conformal invisible device with feasible refractive indexes

Optical conformal mapping has been used to construct several isotropic devices with novel functionalities. In particular, a conformal cloak could confer omnidirectional invisibility. However, the maximum values of the refractive indexes needed for current designs are too large to implement, even in microwave experiments. Furthermore, most devices designed so far have had imperfect impedance mat...