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Invisibility cloak is almost here!

None | ByAssociated Press, Washington
Oct 20, 2006 01:06 PM IST

A team of American and British researchers has made a cloak of invisibility. Well, OK, it's not perfect. Yet. 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.

A team of American and British researchers has made a cloak of invisibility. Well, OK, it's not perfect. Yet. 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.

HT Image
HT Image

Like light and radar waves, microwaves bounce off objects making them visible and creating a shadow, though it has to be detected with instruments. If you can hide something from microwaves, you can hide it from radar — a possibility that will fascinate the military.

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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