Do-it-yourself invisibility with 3-D printing

             This is Yaroslav Urzhumov. Credit: Duke University
http://phys.org/news/2013-05-do-it-yourself-invisibility-d.html
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.

"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."

 Explore further: Invisibility cloak research moves forward at MTU

More information: "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

Metamaterials Make Physics Seem Like Magic

Metamaterials Make Physics Seem Like Magic

David Smith & Yaroslav Urzhumov Duke University Pratt School of Engineering Durham, NC Jeff Wilson NASA Glen Research Center, Cleveland, OH Fabio Alves and Gamani Karunasiri Naval Postgraduate School Monterey, CA

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Metamaterials are manufactured, structured materials that they can interact and manipulate wave phenomena such that objects surrounded by metamaterials are shielded from these waves. In the case of light, metamaterials make these objects ‘invisible’. Researchers throughout the world are applying these materials to many different applications.

At NASA Glen Research Center, physicists are currently working on potential applications for metamaterials, including a “superlens” that would provide much higher resolution than what is possible using natural materials, by utilizing the negative refraction of metamaterials.

Researchers at the Naval Postgraduate School in California are working with metamaterials in a metafilm for terahertz (THz) imaging technologies. Electromagnetic waves in the THz scale are commonly used in airport scanners as they can penetrate non-metallic materials without damaging tissue or DNA. Yet, they require expensive and complex imaging arrangements to combat the fact that most THz waves are absorbed in the air prior to reaching the target. The metafilm must be designed using the appropriate materials and geometry to attain near 100% transmission at the desired frequency.

At the Center for Metamaterials and Integrated Plasmonics (CMIP) at Duke University, led by David R. Smith, researchers are working with Toyota to use metamaterials for a wireless transfer of power in an electrical vehicle. They have accomplished this task by making the distance between the power source and the device disappear with a metamaterial-based lens.

All of these researchers used COMSOL Multiphsyics to implement, verify and optimize the designs. Further, they are using COMSOL to conceptually investigate new uses for metamaterials.