Researchers have “cloaked” a three-dimensional object, making it invisible from all angles, for the first time.
However, the demonstration works only for waves in the microwave region of the electromagnetic spectrum.
It uses a shell of what are known as plasmonic materials; they present a “photo negative” of the object being cloaked, effectively cancelling it out.
The idea, outlined in New Journal of Physics, could find first application in high-resolution microscopes.
Most of the high-profile invisibility cloaking efforts have focused on the engineering of “metamaterials” – modifying materials to have properties that cannot be found in nature.
The modifications allow metamaterials to guide and channel light in unusual ways – specifically, to make the light rays arrive as if they had not passed over or been reflected by a cloaked object. …