"The face that is dark does not see the light, so there's no way you can correct for (the shadow) with this technique," Gaburro said.īut Zhang is confident the technology can eventually be scaled up. The experiment using the reflective silicon oxide and silicon nitride material was described in the journal Nano Letters. Nor can the features to be hidden be too large or sharp compared to the wavelength of light, because any shadows cast cannot be erased, Zeno Gaburro, a physicist at the University of Trento in Italy, was quoted as saying in an accompanying article about the technology in the journal Science. It can’t quite cover Harry Potter, yet, but an invisibility cloak developed by UC Berkeley engineers was able to bounce visible light waves away from a microscopic object about as big as a red blood cell. However, this little cloak still has some big limitations.įor instance, the patterns of the nanoantennas must be precisely engineered to match the surface bumps of the object beneath, meaning the object cannot move or it would lose its invisible cover.
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