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Do-it-yourself invisibility with 3-D printing

Date:
May 6, 2013
Source:
Duke University
Summary:
Seven years ago, Duke University engineers demonstrated the first working invisibility cloak in complex laboratory experiments. Now it appears creating a simple cloak has become a lot simpler.

Yaroslav Urzhumov.
Credit: Image courtesy of Duke University

Seven years ago, Duke University engineers demonstrated the first working invisibility cloak in complex laboratory experiments. Now it appears creating a simple cloak has become a lot simpler.

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"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 in electrical and computer engineering at Duke's Pratt School of Engineering.

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 said that producing a cloak in this fashion is inexpensive and easy. He and his team made a small one 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 takes from three to seven hours.

The results of Urzhumov's experiments were published online in the journal Optics Letters, and the team's research was supported by the U.S. Army Research Office through a Multidisciplinary University Research Initiative grant.

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 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."

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.


Story Source:

The above story is based on materials provided by Duke University. The original article was written by Richard Merritt. Note: Materials may be edited for content and length.


Journal Reference:

  1. Yaroslav Urzhumov, Nathan Landy, Tom Driscoll, Dimitri Basov, David R. Smith. Thin low-loss dielectric coatings for free-space cloaking. Optics Letters, 2013; 38 (10): 1606 DOI: 10.1364/OL.38.001606

Cite This Page:

Duke University. "Do-it-yourself invisibility with 3-D printing." ScienceDaily. ScienceDaily, 6 May 2013. <www.sciencedaily.com/releases/2013/05/130506103313.htm>.
Duke University. (2013, May 6). Do-it-yourself invisibility with 3-D printing. ScienceDaily. Retrieved November 25, 2014 from www.sciencedaily.com/releases/2013/05/130506103313.htm
Duke University. "Do-it-yourself invisibility with 3-D printing." ScienceDaily. www.sciencedaily.com/releases/2013/05/130506103313.htm (accessed November 25, 2014).

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