Oct. 19, 2006 — A team of American and British researchers has made a Cloak of Invisibility. Well, OK, it's not perfect. But it's a start, and it did a pretty good job of hiding a copper cylinder.
In this experiment the scientists used microwaves to try and detect the cylinder. Like light and radar waves, microwaves bounce off objects, making them visible and creating a shadow, though it has to be detected with instruments
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Cloaking differs from stealth technology, which doesn't make an aircraft invisible but reduces the cross-section available to radar, making it hard to track. Cloaking simply passes the radar or other waves around the object as if it weren't there, like water flowing around a smooth rock in a stream.
The new work points the way for an improved version that could hide people and objects from visible light.
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