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Plan for cloaking device unveiled - TechAmok
Plan for cloaking device unveiled - [technology] 09:39 AM EDT - May,26 2006 - post a comment The
BBC is reporting that a plan for a cloaking device has been unveiled. The
design is pioneered by Professor Sir John Pendry's team of scientists from the
US and Britain. Proof of the ability of his invention could be ready in just 18
months time using radar testing. The method revolves around certain materials
making light "flow" around the given object like water.
The work provides a mathematical "recipe" for bending light waves in such a
way as to achieve a desired cloaking effect. John Pendry, along with colleagues
David Smith and David Schurig at Duke University in North Carolina, US, have
been testing suitable metamaterials for the device they plan to build. This, Sir
John explained, would consist of a sphere or cylinder wrapped in a sheath of
metamaterial which could cloak it from radio waves. "It's not tremendously
fancy, but that for us would be quite an achievement," he told the BBC News
website.
Professor Ulf Leonhardt, author of another cloaking paper in Science,
described the effect for light as a "mirage". "What you're trying to do is
guide light around an object, but the art is to bend it such that it leaves the
object in precisely the same way that it initially hits it. You have the
illusion that there is nothing there," he told the BBC's Science in Action
programme. The work could have uses in military stealth technology - but
engineers have not yet created the materials that could be used to cloak an
aircraft or a tank, John Pendry explains. Professor Pendry's research has been
supported by the US Defense Advanced Research Projects Agency (Darpa).
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