Invisibility cloaks hit the big time

New approach can conceal objects big enough to see

By Daniel Strain, 14:41 PM February 1, 2011

Professor Snape beware — invisibility cloaks aren’t just for the microscopic anymore.

Using natural crystals, two independent research teams have designed “carpet cloaks” that can abracadabra 3-D objects as big as an ant or a grain of sand seemingly into nothing. Up to now, making things invisible has relied on tiny structures called metamaterials. These fabrications are often a mix of stacks and crisscrosses of nano-sized metals and other materials that can guide electromagnetic rays, such...

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