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Invisibility

A Dutch team of scientists has made a huge step toward manufacturing a Harry Potter-style ...

A Harry Potter-style invisibility cloak is one more step closer to reality thanks to the work of a research team at the FOM Institute for Atomic and Molecular Physics (AMOLF) in the Netherlands, which has successfully harnessed the magnetic field of light to develop meta-materials that can deflect light in every possible direction.  Read More

A bump on the metallic floor is hidden, but the cloak itself is visible due to surface ref...

Over the last few years we’ve covered the development of “invisibility cloaks” using metamaterials – man-made structured composite materials exhibiting optical properties not found in nature that can guide light to achieve cloaking and other optical effects. In 2006, scientists at Duke University demonstrated in the laboratory that an object made of metamaterials can be partially invisible to particular wavelengths of light - not visible light, but rather microwaves. A few groups have even managed to achieve a microscopically-sized carpet-cloak. Now researchers have developed software that can show what such a cloaked object will actually look like.  Read More

The structure of the invisible electromagnetic gateway is comprised of two perfect electri...

Harnessing the unique properties of metamaterials, researchers in China have recently published a work detailing the implementation of a thin air, broadband and remotely controllable 'invisible gateway' that is able to shield all types of electromagnetic waves while letting through all other physical objects.  Read More

With active cloaking, three devices placed around an object neutralize and later rebuild t...

Mathematicians at the University of Utah have recently announced they have elaborated an innovative way to shield two-dimensional objects from all types of waves, from electromagnetic to those caused by natural events like earthquakes and tsunamis, leading the way to a completely new approach to achieving invisibility.  Read More

The dc metamaterial designed by the group at UAB is invisible to magnetic and low-frequenc...

Researchers at the Universitat Autonoma de Barcelona have recently designed a peculiar material — called a dc metamaterial — that has the property of making objects wrapped in it undetectable to magnetic and very low-frequency electromagnetic fields. The breakthrough brings the dream of "invisibility cloaking" closer to reality and could have important repercussions in both the military and medical fields.  Read More

Harry Potter and his cloak of invisibility - which you can't see obviously

Invisibility has been a staple of science fiction, (and my own personal fantasies), for decades and in recent years we’ve watched as fiction edges ever closer to reality through the use of metamaterials. The problem with most of the devices currently being researched however, is that since they totally encompass the object being rendered invisible, they are also rendered blind as well, which kind of defeats the purpose. But a team from Hong Kong’s University of Science and Technology believes they have come up with an answer to this problem and that it is indeed possible to create a cloaking device that would be able to render an object invisible without encompassing it.  Read More

A scanning electron microscope image of the fabricated structure, developed by UC Berkeley...

Development in metamaterials - the so called “left handed” composite materials that negatively refract light waves and promise the sci-fi scenario of rendering objects invisible - is accelerating with news this week of two breakthroughs from scientists at the University of California, Berkeley.  Read More

June 16, 2008 Research into the cloaking properties of “left handed” metamaterials is continuing, with the latest news coming from scientists at the Polytechnic University of Valencia who have proven that these man-made substance can make objects impervious to sound waves. A proposed "acoustic cloak" would use sonic crystals, a class of metamaterial, to bend sound waves around an object, and could be used to render vessels Sonar-invisible... perhaps even bring to life that staple of spy technology: the Cone of Silence.  Read More

August 20, 2007 When you’re reporting about new technologies, it’s easy to get carried away with excitement over a breakthrough, particularly when sensationalist press releases are involved. This appears to have happened with Duke University’s somewhat misleading 2006 release announcing “the first demonstration of a working invisibility cloak – and a competing press conference is being called to contest the press releases' claims and demonstrate a 13-year-old technology that’s much closer to delivering optical invisibility.  Read More

First demonstration of a working invisibility cloak

October 20, 2006 A team led by scientists at Duke University's Pratt School of Engineering has demonstrated the first working "invisibility cloak." Now before you get all excited about the prospects of playing the invisible man or Harry Potter, it’s not a Dr Zhivago sort of cloak but an electromagnetic radiation cloaking device and we’re many years from being able to turn an object or person invisible to the naked eye. The cloak deflects microwave beams so they flow around a "hidden" object inside with little distortion, making it appear almost as if nothing were there at all. Cloaks that render objects essentially invisible to microwaves could have a variety of wireless communications or radar applications, according to the researchers. Watch the video.  Read More

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