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Electromagnetic invisibility half-cloak

05.12.2013

Chinese scientists at Nanjing Southeast University have developed a schematic diagram for an invisibility cloak that will hide only part of a hidden object, and have already made a prototype of such a cloak that hides internal direct current.

Physicists have given the name of invisibility cloaks to devices that are able to make radiation (acoustic or electromagnetic) go around a certain object and create the same field on the other side, as if this object does not exist at all. In such a device, the fundamental point is that the radiation does not get inside the object, because of which, being inside, it is impossible to see everything that happens outside.

The authors of the study developed a schematic diagram of a device that can solve this problem. It does not hide the object completely, but only most of it, as a result, it is possible to obtain information from the outside - the authors cite as an example Harry Potter's invisibility cloak, which did not hide the head of a fairy-tale character. Such a device solves not only the problem of information isolation. It is capable of creating optical illusions for an external observer, showing him something other than what he should see. Thus, it is possible, for example, to hide one car under the guise of another.

The prototype, which was created to demonstrate the principled approach, is able to hide from external observation the direct current that flows inside. Structurally, the device is a disk, which consists of many resistors connected by conductors.

Designers of invisibility cloaks often turn to microwave radiation, radio emission and direct current due to technical difficulties: the average size of parts should be smaller, the smaller the wavelength. Operation in the visible light range requires the creation of metamaterials with a characteristic nanometer size of details. To date, the most studied are invisibility cloaks designed to operate in the microwave range. Scientists have learned to make them microscopic and soft.

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