Starship USS Enterprise Captain James T. Kirk about to steal Romulan
Cloaking Device, in the popular 1960s, science-fiction television series
Star Trek. (Image Source: scifilounge.blogspot.com )
Researchers at The University of Texas at Austin have proposed the first design of a cloaking device that uses an external source of energy to significantly broaden its bandwidth of operation.
Andrea Alù, associate professor in the Department of Electrical and Computer Engineering at the Cockrell School of Engineering, and his team have proposed a design for an active cloak that draws energy from a battery, allowing objects to become undetectable to radio sensors over a greater range of frequencies.
The team’s paper, “Broadening the Cloaking Bandwidth with Non-Foster Metasurfaces,” was published in Physical Review Letters. Alù, researcher Pai-Yen Chen and postdoctoral research fellow Christos Argyropoulos co-authored the paper. Both Chen and Argyropoulos were at UT Austin at the time this research was conducted. The proposed active cloak will have a number of applications beyond camouflaging, such as improving cellular and radio communications, and biomedical sensing.
Cloaks have so far been realized with so-called passive technology, which means that they are not designed to draw energy from an external source. They are typically based on metamaterials (advanced artificial materials) or metasurfaces (flexible, ultrathin metamaterials) that can suppress the scattering of light that bounces off an object, making an object less visible. When the scattered fields from the cloak and the object interfere, they cancel each other out, and the overall effect is transparency to radio-wave detectors. They can suppress 100 times or more the detectability at specific design frequencies. Although the proposed design works for radio waves, active cloaks could one day be designed to make detection by the human eye more difficult.
More - Link >>> http://www.scientificcomputing.com/news/2013/12/researchers-design-first-battery-powered-invisibility-cloak?et_cid=3668140&et_rid=544605860&location=top#.UrM63uK4FYE
Sources: University of Texas at Austin, ScientificComputing.com .
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