YOUR mobile phone may soon recharge itself in the same way it transfers information: wirelessly.
Marin Soljacic and colleagues at the Massachusetts Institute of Technology have previously used computer simulations to show that electromagnetic energy stored in one coil can be drained by another of the same resonant frequency (New Scientist, 18 November 2006, p 28).
Now the team has used the technique to transmit enough power across a room to light a 60-watt bulb. A current alternating at 10 megahertz passes through a coil linked to a capacitor, generating oscillating magnetic and electric fields. The fluctuating magnetic field…
