New 'invisibility cloak' type designed

[Still Waters]

A new "broadband" invisibility cloak which hides objects over a wide range of frequencies has been devised.

Despite the hype about Harry Potter-style cloaks, our best current designs can only conceal objects at specific wavelengths of light or microwaves.

At other frequencies, invisibility cloaks actually make things more visible, not less, US physicists found.

http://www.bbc.co.uk...onment-24867090