Invisibility

Light bent the wrong way–can an invisibility cloak be far behind?:
"In a study to be published in Nature, the Berkeley group, led by Xiang Zhang, bent red light using a fishnet-shaped stack of 21 layers of silver and magnesium fluoride, each a few tens of nanometers thick (see diagram). (One nanometer is a billionth of a meter.) The group will also report in Science that it bent near-infrared light using a thinner sheet of aluminum oxide containing silver nanowires. The researchers believe that the second material ought to work on red light as well. Both devices absorbed relatively little of the incoming light—a problem in earlier metamaterials, the group says."
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Scientific American Blog

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