It would be so convenient if our various gadgets could pull power from the air, and not have to be plugged in – particularly when every item has a different shape of power connector and power requirement.
US researchers have outlined a relatively simple system that could deliver power to devices such as laptop computers or MP3 players without wires.
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The answer the team came up with was "resonance", a phenomenon that causes an object to vibrate when energy of a certain frequency is applied.
"When you have two resonant objects of the same frequency they tend to couple very strongly," Professor Soljacic told the BBC News website.
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...the team investigated a special class of "non-radiative" objects with so-called "long-lived resonances".
When energy is applied to these objects it remains bound to them, rather than escaping to space. "Tails" of energy, which can be many metres long, flicker over the surface.
"If you bring another resonant object with the same frequency close enough to these tails then it turns out that the energy can tunnel from one object to another," said Professor Soljacic.
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