Professor invents radar invisibility cloak

The device can steer microwaves around it to make objects undetectable by radar. Experts are confident it can be developed to do the same with light rays — making things invisible to the naked eye, just like boy wizard Harry Potter’s cloak. A team led by Professor Sir John Pendry constructed the prototype at Duke University in North Carolina. It is made of ten fibreglass rings covered in wave-deflecting copper. Describing how it works, his colleague Professor David R Smith said: “All electromagnetic waves are swept around the area . . . to emerge on the other side as if they’d passed through an empty volume of space.” Prof Pendry, of Imperial College London, unveiled the blueprint earlier this year. It has been part-funded by the U.S. defense department.