Invisibility cloaks could slim down with active approach

Light-blocking antennas could hide objects of any shape and size

By Gabriel Popkin, 16:26 PM November 21, 2013

A new light-canceling technique could help scientists make thin invisibility cloaks that block a large range of wavelengths.

The new technique is “a smart engineering trick” that is “quite different from the way cloaking has been approached so far,” says Andrea Al├╣, a physicist at the University of Texas at Austin.

Nearly all invisibility cloaks use light-manipulating compounds called metamaterials to bend light around an object, rendering the object transparent. Such technology has become inc...

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