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Invisibility Cloaks for Visible Light Must Remain Tiny, Theorists Predict

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Science  25 Jun 2010:
Vol. 328, Issue 5986, pp. 1621
DOI: 10.1126/science.328.5986.1621-a

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Three years ago, physicists unveiled the first invisibility cloak, a ring-shaped device that ferried microwaves around an object and made it undetectable to microwave receivers. Since then, scientists have pushed to make a cloak for shorter-wavelength visible light. But those efforts will never lead to something you can hide in, one team of researchers predicts. The researchers say a cloak for visible light would be so small it could hide only objects almost too tiny to be seen. But the limit may not apply to some types of cloaks, other experts counter.