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Science & Technology
A New Design Of A Real-Life Invisibility Cloak Much Closer To Perfection
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<blockquote data-quote="Opmmur" data-source="post: 78124" data-attributes="member: 13"><p><span style="font-size: 26px"><em><a href="http://www.messagetoeagle.com/lifeoriginatedinspace.php" target="_blank"><strong>First Battery-Powered Invisibility Cloak Proposed</strong></a></em></span></p><p>25 December, 2013</p><p></p><p></p><p> <strong>MessageToEagle.com</strong> - A cloaking device that uses an <u>external source of energy</u> to significantly broaden its bandwidth of operation is proposed by a team of researchers at The University of Texas at Austin.</p><p></p><p>This active cloak draws energy from a battery and allows objects to become undetectable to radio sensors over a greater range of frequencies.</p><p></p><p>The proposed active cloak will have a number of applications beyond camouflaging, such as improving cellular and radio communications, and biomedical sensing.</p><p></p><p><img src="http://www.messagetoeagle.com/images/batterycloak01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>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.</p><p></p><p>They are typically based on metamaterials (advanced artificial materials) or metasurfaces (a flexible, ultrathin metamaterial) that can suppress the scattering of light that bounces off an object, making an object less visible.</p><p></p><p>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 <u>100 times or more</u> the detectability at specific design frequencies.</p><p></p><p>Although the proposed design works for radio waves, active cloaks could one day be designed to make detection by the human eye more difficult.</p><p></p><p>"We prove that cloaks can become broadband, pushing this technology far beyond current limits of passive cloaks," said Andrea Alù, associate professor at the <a href="http://www.engr.utexas.edu/" target="_blank">Cockrell School of Engineering</a>, who along with ai-Yen Chen and postdoctoral research fellow Christos Argyropoulos co-authored the research paper.</p><p></p><p>"I believe that our design helps us understand the fundamental challenges of suppressing the scattering of various objects at multiple wavelengths and shows a realistic path to overcome them."</p><p></p><p><a href="http://www.messagetoeagle.com/images/betterypoweredcloak01.jpg" target="_blank"> <img src="http://www.messagetoeagle.com/images/betterypoweredcloak01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> </p><p>Click on image to enlarge</p><p><em></em></p><p><em>Schematics of (a) an ultrathin metasurface formed by structured metal (top) combined with lumped NICs based on CMOS technology; (b) assembly of an active non-Foster metasurface; (c) a mantle cloak designed for a dielectric infinite cylinder under TM illumination. Credit: Pai-Yen Chen, Christos Argyropoulos, and Andrea Alù </em></p><p></p><p>The proposed active cloak uses a battery, circuits and amplifiers to boost signals, which makes possible the reduction of scattering over a greater range of frequencies.</p><p></p><p>This design, which covers a very broad frequency range, will provide the most broadband and robust performance of a cloak to date. Additionally, the proposed active technology can be thinner and less conspicuous than conventional cloaks.</p><p></p><p>"In our case, by introducing these suitable amplifiers along the cloaking surface, we can break the fundamental limits of passive cloaks and realize a 'non-Foster' surface reactance that decreases, rather than increases, with frequency, significantly broadening the bandwidth of operation," Alù said.</p></blockquote><p></p>
[QUOTE="Opmmur, post: 78124, member: 13"] [SIZE=7][I][URL='http://www.messagetoeagle.com/lifeoriginatedinspace.php'][B]First Battery-Powered Invisibility Cloak Proposed[/B][/URL][/I][/SIZE] 25 December, 2013 [B]MessageToEagle.com[/B] - A cloaking device that uses an [U]external source of energy[/U] to significantly broaden its bandwidth of operation is proposed by a team of researchers at The University of Texas at Austin. This active cloak draws energy from a battery and allows objects to become undetectable to radio sensors over a greater range of frequencies. The proposed active cloak will have a number of applications beyond camouflaging, such as improving cellular and radio communications, and biomedical sensing. [IMG]http://www.messagetoeagle.com/images/batterycloak01.jpg[/IMG] 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 (a flexible, ultrathin metamaterial) 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 [U]100 times or more[/U] 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. "We prove that cloaks can become broadband, pushing this technology far beyond current limits of passive cloaks," said Andrea Alù, associate professor at the [URL='http://www.engr.utexas.edu/']Cockrell School of Engineering[/URL], who along with ai-Yen Chen and postdoctoral research fellow Christos Argyropoulos co-authored the research paper. "I believe that our design helps us understand the fundamental challenges of suppressing the scattering of various objects at multiple wavelengths and shows a realistic path to overcome them." [URL='http://www.messagetoeagle.com/images/betterypoweredcloak01.jpg'] [IMG]http://www.messagetoeagle.com/images/betterypoweredcloak01.jpg[/IMG][/URL] Click on image to enlarge [I] Schematics of (a) an ultrathin metasurface formed by structured metal (top) combined with lumped NICs based on CMOS technology; (b) assembly of an active non-Foster metasurface; (c) a mantle cloak designed for a dielectric infinite cylinder under TM illumination. Credit: Pai-Yen Chen, Christos Argyropoulos, and Andrea Alù [/I] The proposed active cloak uses a battery, circuits and amplifiers to boost signals, which makes possible the reduction of scattering over a greater range of frequencies. This design, which covers a very broad frequency range, will provide the most broadband and robust performance of a cloak to date. Additionally, the proposed active technology can be thinner and less conspicuous than conventional cloaks. "In our case, by introducing these suitable amplifiers along the cloaking surface, we can break the fundamental limits of passive cloaks and realize a 'non-Foster' surface reactance that decreases, rather than increases, with frequency, significantly broadening the bandwidth of operation," Alù said. [/QUOTE]
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A New Design Of A Real-Life Invisibility Cloak Much Closer To Perfection
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