U.S. scientists one step closer to cloaking device

A Klingon's warship in "Star Trek" -- a Bird of Prey used a cloaking device to become invisible.

U.S. scientists are getting closer to engineering material that could make three-dimensional objects invisible to the human eye, though they're nowhere close to duplicating the "cloaking device" used by alien Klingons in "Star Trek," according to media reports Monday.

Previously, they only have been able to cloak very thin two-dimensional objects.

The findings, by scientists at the University of California, Berkeley, led by Xiang Zhang, are to be released later this week in the journals Nature and Science.

Cloaking uses metamaterials to deflect radar, light or other waves around an object.

Metamaterials are mixtures of metal and circuit board materials such as ceramic, Teflon or fiber composite. They are designed to bend visible light in a way that ordinary materials don't. Scientists are trying to use them to bend light around objects so they don't create reflections or shadows.