Contact: Ken Kingery
Caption: This small copper coil created the electromagnetic field by running an alternating electric current through it. In the background is the metamaterial "superlens" that focused the electromagnetic field onto another identically sized copper coil on the other side, which greatly increased the wireless transfer's power.
Credit: Courtesy of Guy Lipworth and Joshua Ensworth, graduate student researchers at Duke University
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Related news release: 'Superlens' extends range of wireless power transfer