It’s no magic: Invisibility cloak now available in a slim, form-fitting design – CSMonitor.com
“We see objects by collecting whatever they radiate,”
One approach to cloaking is to change the behavior of electromagnetic radiation – radio or light, for instance – in ways that send the radiation around the object, rather than scattering some of it back at the detector trying to “see” the object.
Cloaks to accomplish this generally have been made from so-called metamaterials – materials engineered to display traits that aren’t found in nature. The team led by Jason Soric, in the department of Electrical and Computer Engineering at the University of Texas at Austin, designed its cloaking system using metamaterials as well. But instead of trying to bend radiation around the object so that none is scattered back to an observer, the researchers opted to use a cloak to change the properties of the radiation itself in ways that would cancel out the radiation scattered from an object.
“The overall effect is transparency,” says Dr. Alu.
To pull off the feat, the team relied on the wave-like properties of electromagnetic radiation. The team surrounded a seven-inch-long cylinder with an ultra-thin cloak made from a polycarbonate film. The film was criss-crossed with a fishnet-like mesh made from copper tape.
- Ultrathin ‘metascreen’ forms latest invisibility cloak (physicsworld.com)
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