Invisibility Cloak is Technically Possible and Even 3D-Printable
Duke University engineers demonstrated the first working invisibility cloak in complex laboratory experiments seven years ago -- and now they manufactured this interesting item using a simple plastics 3D-printer.
"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," said Yaroslav Urzhumov, assistant research professor at Duke.
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.
Urzhumov said that producing a cloak in this fashion is inexpensive and easy, since a consumer-grade 3D-printer processing plastic filament can be used. He and his team demonstrated this with a small cloak at Duke which looks like a Frisbee™ disc made out of Swiss cheese. Algorithms determined the location, size and shape of the holes to deflect microwave beams. The fabrication process with such a printer takes from three to seven hours.
The results of Urzhumov's experiments were published online in the journal Optics Letters
"We believe this approach is a way towards optical cloaking, including visible and infrared," Urzhumov said. "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," said 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 said 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 said. "I have run some simulations that seem to confirm this point."
"Thin Low-Loss Dielectric Coatings for Free-Space Cloaking," Y. Urzhumov, et al. Optics Letters. Online May 3, 2013. DOI 10.1364/OL.38.001606.