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Posted by on Nov 12, 2012 in Science |

First demonstration of invisibility cloak almost “perfect”

Published a few hours ago in Nature Materials, scientists have successfully achieved invisibility cloak on an object almost perfectly . A few centimeters cylinder has been completely invisible to microwave light, the first time is achieved.

And is that so far there have been many efforts and test cloaks. None almost perfect because all incident light reflected, and therefore an illusion which hitherto was incomplete.

The effect achieved by scientists from Duke University, the same as the first tests began in 2009, means the biggest breakthrough to date. An improvement of the device through a new metamaterial that achieved with an object, a cylinder of 7.5 cm wide by one high, completely becomes invisible to microwave (wavelengths much longer than we see). Put another way, the experiment did not reflect any existed no trace of the object, a milestone that could be a new way to revolutionize the transmission of waves and light.

These metamaterials with Duke are working in very different natural properties that the latter do not possess. Thus, the entire carrying structure can be metamaterial designed to guide electromagnetic waves on an object. What you get is that “pass” on the other side as if from an empty space or transparent question.

Nathan Landy and David Smith, principal investigator of the invention, thus explaining the experiment:

He succeeded, to our knowledge, is the first layer that truly speaks to get that perfect invisibility. This layer leads to something that could be potentially useful. I think it’s something that many people can build. Everything in this country is going to come down if we think we can do, what we can design. We believe that this will increase in the future design.

And the layer obtained by Smith and Landy design makes use of a copper strips adding one material to achieve better performance when used in 2009. Strips device with diamond and its empty center. According Landy:

Before, each quadrant of the layer tended to have gaps or blind spots at their intersections and corners with the other. Now, with the new layer, is divided into two light waves traveling around an object in the center and emerging as a single wave with a minimum loss by reflection.

A milestone that now goes to a second phase. The research teams will try to use the knowledge gained from invisibility cloaks in three dimensions.

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