invisibility cloak
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Cloaking device puts the kibosh on cellphone interference
There has been plenty of research into cloaking devices, but while scientists are still working their way towards the visible light spectrum they seem to be having the best luck with microwaves. Most recently, a new metamaterial made from over 10,000 individual pieces of fiberglass has been used to cloak a bump on a flat mirrored surface -- the material prevents microwaves from being scattered, giving the RADAR (we're guessing it's a RADAR) the impression that the surface is flat. This has many possible applications, such as cloaking sources of interference to cellular communications. Unfortunately, the implication we most desire -- rendering us invisible during high society jewel heists -- has yet to become reality.
Researchers create light bending material for invisibility cloak
We're only at the nano scale folks so you'll have to keep those high school fantasies of an invisibility-cloaked romp through the girls' locker room tucked away for now. Still, two teams of US government funded researchers under the direction of Xian Zhanga at UC Berkeley say that they've developed a material which can bend visible light around 3D objects, effectively making them disappear. While similar to the negative refractive properties of materials developed back in 2006, UCB's so-called meta-material is easier to work with and absorbs far less light than those earlier products. As such, the material could scale to the size of invisibility cloaks to hide objects such as tanks or mischievous boy-wizards. However, that day is a long ways off. In the short term, the meta-material will most likely find use in the far less interesting (to consumers, anyway) application of building better microscopes. Hey, Xian, picture of your invisible material or it didn't happen... oh, wait.[Via BBC News]
Researchers say three-dimensional sound cloak is possible, in theory
Apparently not content with simply building an invisibility cloak, of sorts, those mad scientists at Duke University's Pratt School of Engineering now say that they've found that a three-dimensional "sound cloak" is also possible, in theory. According to Duke's Steven Cummer, the researchers have come up with a "recipe" for an acoustic material that would "essentially open up a hole in space and make something inside that hole disappear from sound waves." Needless to say, they haven't tested that possibility just yet, but they say it could one day be used to hide submarines from detection by sonar or even be used to improve the acoustics of a concert hall by making inconvenient structural beams effectively disappear. What's more, they say that the basic principles at play here could also suggest that cloaks could be created for other wave systems, like seismic waves, or even waves at the surface of the ocean, although the practical applications for those would seem to be a bit more limited.[Image courtesy of Royal Navy/BAE Systems]
Duke scientists build theorized invisibility cloak. Sort of.
Yes, everyone wants an invisibility cloak. Yes, it's been theorized and in development before. But now, what our friends across the pond have only imagined, scientists at an American university have actually built. A group of brainiacs at Duke University have built a device (based on the Imperial College London theory) that can deflect microwave beams so the beams flow around an object almost as if nothing was there, with not too much distortion (but only in two dimensions). In order to do this, the group built a series of concentric circles made up of "metamaterials," or "artificial composites that can be made to interact with electromagnetic waves in ways that natural materials cannot reproduce." Don't get too excited yet, as scientists warn that this is merely a "baby step." The next step is to make the cloak work in three dimensions, and make improve the cloak's effectiveness. And even still, we're a long way off from making something completely disappear from visibility, which "would have to simultaneously interact with all of the wavelengths, or colors, that make up light." said David R. Smith, a member of the research squad. Hey Duke team, if you ever need human test subjects, we'd definitely be willing to volunteer.[Via The Associated Press]
UK scientists working on cloaking device
We've heard of these kinds of guys before. They've spent too much time engrossed in Harry Potter books or old Star Trek episodes, and dream of some sort of device that will make them invisible. Every couple of years, one of them surfaces with a new idea about a "cloaking device" that can bend light around solid objects, making them appear to be invisible. This time, two separate teams in the UK are racing to show that the concept is feasible. One group, at Imperial College in London, believes that light-bending metamaterials can be produced within the next decade. Meanwhile, two mathematicians have published a study in the Proceedings of the Royal Society, which claims that a "superlens" placed close to an object could produce an "anomalous localized resonance," essentially rendering the underlying object invisible by creating a phantom light wave using the same frequency. The scientists envision building a device soon -- one that could conceivably cloak particles of dust. We'll check back with both parties in a few years. In the meantime, we'd like to present our detailed artist's rendering, prepared at great cost and with much research, which we believe truly shows what a cloaked object will look like to the naked eye. Read - MetamaterialsRead - Superlens
