Researchers extend range of wireless power transfer

Researchers at Duke University's Pratt School of Engineering have developed a method of transmitted energy wirelessly over distances greater than the size of the transmitter and receiver.

The team used metamaterials to create a "superlens" that focuses magnetic fields. The superlens "looks like a few dozen giant Rubik's cubes stacked together," according to information released by Duke University. "Both the exterior and interior walls of the hollow blocks are intricately etched with a spiraling copper wire reminiscent of a microchip" that interacts with the magnetic field to form a cone of more intense power.

"For the first time we have demonstrated that the efficiency of magneto-inductive wireless power transfer can be enhanced over distances many times larger than the size of the receiver and transmitter," said Yaroslav Urzhumov, an assistant research professor of electrical and computer engineering at Duke University. "This is important because if this technology is to become a part of everyday life, it must conform to the dimensions of today's pocket sized mobile electronics."

Going forward, Urzhumov wants to drastically upgrade the system to make it more suitable for realistic power transfer scenarios, such as charging mobile devices as they move around in a room. He plans to build a dynamically tunable superlens, which can control the direction of its focused power cone.

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