![]() “We have shown that you don’t need a bulk metamaterial to cancel the scattering from an object a simple patterned surface that is conformal to the object may be sufficient and, in many regards, even better than a bulk metamaterial.” “The advantages of the mantle cloaking over existing techniques are its conformability, ease of manufacturing and improved bandwidth,” Alú said. “When the scattered fields from the cloak and the object interfere, they cancel each other out, and the overall effect is transparency and invisibility at all angles of observation,” said Andrea Alú, a co-author and an assistant professor in the Department of Electrical and Computer Engineering. Unlike previous cloaking studies that have used metamaterials to divert, or bend, the incoming waves around an object, this new method, which the researchers dub “mantle cloaking,” uses an ultrathin metallic metascreen to cancel out the waves as they are scattered off the cloaked object. The reason we see objects is because light rays bounce off their surfaces toward our eyes, and our eyes are able to process the information. Objects are detected when waves whether they are sound, light, X-rays or microwaves rebound off their surfaces. The researchers also predict that because of the inherent conformability of the metascreen and the robustness of the proposed cloaking technique, oddly shaped and asymmetrical objects can be cloaked with the same principles. ![]() It was used to cloak an 18 cm cylindrical rod from microwaves and showed optimal functionality when the microwaves were at a frequency of 3.6 GHz and over a moderately broad bandwidth. The metascreen cloak was made by attaching thin strips of copper tape to a flexible polycarbonate film, which is a fraction of a millimeter thick, in a fishnet design. Presenting their study today, March 26, in the Institute of Physics and German Physical Society’s New Journal of Physics, the researchers from the Cockrell School of Engineering‘s Department of Electrical and Computer Engineering have used a new, ultrathin layer called a “metascreen.” However, researchers at The University of Texas at Austin have developed a cloak that is just micrometers thick and can hide three-dimensional objects from microwaves in their natural environment, in all directions and from all of the observers’ positions. Until now, the invisibility cloaks put forward by scientists have been bulky devices an obvious flaw for those interested in Harry Potter-style applications.
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