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All Articles Tagged As: metamaterials
 | Durdu Guney's theoretical negative-index metamaterial works by overcoming the diffraction limit throughout the visible spectrum. ...> Full Article |
Progress of metamaterials in nanotechnologies has made the invisibility cloak, a subject of mythology and science fiction, become reality: Light waves can be guided around an object to be hidden, in such a way that this object appears to be non-existent.
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Electrical engineers at the University of Arizona studying a negative index metamaterial have observed a previously unheard of net gain at microwave frequency, demonstrating a previously debated hypothesis; study to be published in forthcoming APS journal, Physical Review Letters.
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A research team at the University of Alberta wants to refine the optical transmission of information by using a single photon, the fundamental building block of light that can allow unprecedented applications in optical information transfer.
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 | Electrical engineers at Duke University have developed a material that allows them to manipulate light in much the same way that electronics manipulate flowing electrons. ...> Full Article |
New research is aiming to transform the fiction of invisibility and turn it into reality.
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In this month's special issue of Physics World, which examines the science and applications of invisibility, Martin McCall and Paul Kinsler of Imperial College London describe a new type of invisibility cloak that does not just hide objects -- but events.
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 | "Seeing something invisible with your own eyes is an exciting experience," say Joachim Fischer and Tolga Ergin. For about one year, both physicists and members of the team of professor Martin Wegener at KIT's Center for Functional Nanostructures have worked on refining the structure of the Karlsruhe invisibility cloak to such an extent that it is also effective in the visible spectral range. ...> Full Article |
A new National Science Foundation-sponsored industry and university cooperative research center program will "provide a one-stop shop for the design, fabrication and testing of a wide range of metamaterials." Dr. David Crouse, associate professor of electrical engineering in the Grove School of Engineering at The City College of New York, serves as director of the new Center for Metamaterials.
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 | A very simple bench-top technique that uses the force of acoustical waves to create a variety of 3-D structures will benefit the rapidly expanding field of metamaterials and their myriad applications -- including "invisibility cloaks."
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 | Cheaper, lighter and more energy-efficient broadband devices on communications satellites may be possible using metamaterials to modify horn antennas, according to engineers from Penn State and Lockheed Martin Corp. ...> Full Article |
 | Led by mechanical science and engineering professor Nicholas Fang, Illinois researchers have demonstrated an acoustic cloak, a technology that renders underwater objects invisible to sonar and other ultrasound waves. In a paper accepted for publication in the journal Physical Review Letters, Fang's team describe their working prototype, metamaterial capable of hiding an object from a broad range of sound waves. Sixteen layers of specially structured acoustic circuits bend sound waves to wrap them around the outer layers of the cloak. ...> Full Article |
 | Berkeley Lab researchers have discovered Möbius symmetry in metamaterials -- materials engineered from artificial "atoms" and "molecules." This phenomenon, never observed in natural materials, could open new avenues for unique applications in quantum electronics and optics. ...> Full Article |
 | Costas Soukoulis of Iowa State University and the Ames Laboratory writes about the development of optical metamaterials in the latest issue of the journal Science. He writes advanced fabrication techniques may make the man-made materials a practical way to control light for superlenses and other applications. ...> Full Article |
 | Scientists have developed a recipe for manipulating the speed of light as it passes over an object, making it theoretically possible to "cloak" the object's movement so that an observer doesn't notice, according to a paper in the Journal of Optics. ...> Full Article |
 | A collaborative team of applied scientists from Harvard University and the University of Leeds have demonstrated a new terahertz (THz) semiconductor laser that emits beams with a much smaller divergence than conventional THz laser sources. The advance, published in the August 8th issue of Nature Materials, opens the door to a wide range of applications in terahertz science and technology. Harvard has filed a broad patent on the invention. ...> Full Article |
Now a group of scientists at Nanjing University in China have shown how a rather wide spectrum of light -- a rainbow of radiation -- can be trapped in a single structure. They propose to do this by sending the light rays into a self-similar-structured dielectric waveguide -- essentially a light pipe with a cladding of many layers.
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Chinese researchers have successfully built an electromagnetic absorbing device for microwave frequencies. The device, made of a thin cylinder comprising 60 concentric rings of metamaterials, is capable of absorbing microwave radiation, and has been compared to an astrophysical black hole (which, in space, soaks up matter and light).
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Team makes strides in detecting and controlling terahertz radiation
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 | A group of scientists led by researchers from Caltech has engineered a type of artificial optical material -- a metamaterial -- with a particular three-dimensional structure such that light exhibits a negative index of refraction upon entering the material. In other words, this material bends light in the "wrong" direction from what normally would be expected, irrespective of the angle of the approaching light. ...> Full Article |
 | In an advance that might interest Q-Branch NIST and partners from industry and academia have designed and tested experimental antennas that are highly efficient and yet a fraction of the size of standard antenna systems with comparable properties. ...> Full Article |
 | Duke University engineers have created a new generation of lens that could greatly improve the capabilities of telecommunications or radar systems to provide a wide field of view and greater detail. ...> Full Article |
 | Two Kent State University professors are part of a team of researchers who recently uncovered a way to pack tetrahedra, considered to be the simplest shaped regular solids with its four triangular sides, more densely than ever before. ...> Full Article |
 | Physicists at Zhejiang University in China and the Massachusetts Institute of Technology has developed a new metamaterial structure that successfully demonstrates reverse Cerenkov radiation. ...> Full Article |
 | Berkeley Lab researchers have developed the world's first acoustic hyperlens, a device that provides an eightfold boost in the magnification power of ultrasound, underwater sonar and other sound-based imaging technologies. ...> Full Article |
While the researchers can't promise delivery to a parallel universe or a school for wizards, books like Pullman's Dark Materials and JK Rowling's Harry Potter are steps closer to reality now that researchers in China have created the first tunable electromagnetic gateway.
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 | Recent research at the National Institute of Standards and Technology (NIST) has demonstrated that thin films made of "metamaterials"-manmade composites engineered to offer strange combinations of electromagnetic properties-can reduce the size of resonating circuits that generate microwaves. The work is a step forward in the worldwide quest to further shrink electronic devices such as cell phones, radios, and radar equipment. ...> Full Article |
 | A research team has created an easy-to-produce material from the stuff of computer chips that has the rare ability to bend light in the opposite direction from all naturally occurring materials. This startling property may contribute to significant advances in many areas, including high-speed communications, medical diagnostics and detection of terrorist threats. ...> Full Article |
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