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'Invisibility Cloak' Directs Light Away From Eye

March 6, 2009 -- Call it what you will -- the world's first 3D nanoantenna or an invisibility cloak -- but a new metamaterial created by Rice University scientists could hide objects from human sight.

By creating perfectly aligned dimples in a material, the scientists channeled specific wavelengths of light from many directions into one uniform direction.

"This falls into the broad class of metamaterials that have useful and unusual properties, like cloaking," said Naomi Halas, Rice University scientist and co-author of a paper describing the material in Nano Letters. "In a broader picture, you could do some very interesting things with this metamaterial."

The first "invisibility cloak," which hid objects from relatively long-wavelength radio waves, was created in 2006 by scientists from Duke University. Since then scientists have tried to create ever-smaller structures to manipulate ever-smaller wavelengths of light, with the goal of creating a true invisibility cloak that would hide objects in the visible spectrum of light.