A real invisibility cloak

Unlike previous such "cloaks", the new work does not employ metals, which introduce losses of light and result in imperfect cloaking. It's made from silicon.

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Cloaking objects at a distance

One of the disadvantages of invisibility cloaks is that anything placed inside one is automatically blinded, since no light can get in. Now Yun Lai and colleagues from The Hong Kong University of Science and Technology have come up with a way round this using the remarkable idea of cloaking at a distance. This involves using a “complementary material” to hide an object outside it.

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