A metamaterial, a manmade substance that has properties outside those found in nature, made at Duke University has been shown to efficiently transmit power wirelessly to devices. In a similar way of Duke U's 2006 invisibility cloak, where microwaves are deflected around an object so it does not appear on instruments, power is transmitted in such a way that no distance is apparent between transmitter and receiver. Yaroslav Urzhumov, assistant research professor at the Pratt School of Engineering, said, "The system would need to be tailored to the specific recipient device, in essence the source and target would need to be 'tuned' to each other. This new understanding of how matematerials can be fabricated and arranged should help make the design of wireless power transmission systems more focused." The transmitter would be made of thousands of thin conducting loops in an array of copper-on-fiberglass substrate where all unused copper is etched away. The final shape is a sort of "hyperlens" where the energy can be focused and directed. This setup allows for the energy to be more focused and less scattered than other wireless power systems. This is a different strategy compared to the Witricity magnetic resonance, for the record.
pics via Duke University