'Cloaking' a 3-D object from all angles demonstrated

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...