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New invisibility cloak is 3D-printed ‘frisbee’

DUKE (US) — Seven years ago, the first working invisibility cloak resulted from complex laboratory experiments. It’s now easier and cheaper to make a simple cloak.

“I would argue that essentially anyone who can spend a couple thousand dollars on a non-industry grade 3-D printer can literally make a plastic cloak overnight,” says Yaroslav Urzhumov, assistant research professor in electrical and computer engineering at Duke University’s Pratt School of Engineering.

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Three-dimensional printing, technically known as stereolithographic fabrication, has become increasingly popular, not only among industry, but for personal use. It involves a moving nozzle guided by a computer program laying down successive thin layers of a material—usually a polymer plastic—until a three-dimensional object is produced.

Urzhumov says that producing a cloak in this fashion is inexpensive and easy. He and his team made a small one that looks like a Frisbee made of Swiss cheese. Algorithms determined the location, size, and shape of the holes to deflect microwave beams. The fabrication process takes from three to seven hours.

The results of Urzhumov’s experiments are published online in the journal Optics Letters.

Just like the 2006 cloak, the newer version deflects microwave beams, but researchers feel confident that in the not-so-distant future, the cloak can work for higher wavelengths, including visible light.

“We believe this approach is a way towards optical cloaking, including visible and infrared,” Urzhumov says. “And nanotechnology is available to make these cloaks from transparent polymers or glass. The properties of transparent polymers and glasses are not that different from what we have in our polymer at microwave frequencies.”

The disk-like cloak has an open area in its center where the researchers placed an opaque object. When microwave beams were aimed at the object through the side of the disk, the cloak made it appear that the object was not there.

“The design of the cloak eliminates the ‘shadow’ that would be cast, and suppresses the scattering from the object that would be expected,” says Urzhumov. “In effect, the bright, highly reflective object, like a metal cylinder, is made invisible. The microwaves are carefully guided by a thin dielectric shell and then re-radiated back into free space on the shadow side of the cloak.”

Urzhumov says that theoretically, the technique can be used to create much larger devices.

“Computer simulations make me believe that it is possible to create a similar polymer-based cloaking layer as thin as one inch wrapped around a massive object several meters in diameter,” he says. “I have run some simulations that seem to confirm this point.”

Other members of the team included Duke’s Nathan Landy and David R. Smith, as well as Tom Driscoll and Dimitri Basov at the University of California, San Diego.
The US Army Research Office supported their research.

Source: Duke University

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