Metamaterials Could Help Wirelessly Charge Electronics by Making Space Disappear

By Valerie Ross | May 25, 2011 4:03 pm

What’s the News: Metamaterials could improve wireless power transfer, letting us one day charge our devices without the hassle of cords and wires, says a study published last week in Physical Review B. While wireless power transfer already works to for tiny amounts of energy, metamaterials could theoretically be used to safely and efficiently boost the technique to handle more power, such as microwaves and lasers.

How the Heck:

  • Using current techniques, the amount of energy needed to charge personal electronics could, if transmitted wirelessly, burn up whatever’s in its way—up to and including the device it’s supposed to charge. What’s more, energy tends to dissipate through open space, making this sort of power transfer extremely inefficient.
  • But the researchers calculated that certain metamaterials—specifically, ones with effectively negative index of refraction—could transmit the needed power without frying anything. The metamaterials could be used to make a superlens that would stand between the power source and the device, essentially focusing the energy so it doesn’t scatter.
  • According to their analyses, a hypothetical metamaterial array composed of thin copper-fiberglass loops, and resembling a set of Venetian blinds, could do the trick.

What’s the Context:

Not So Fast:

  • Since the study was purely theoretical, scientists will still have to build and test out these metamaterial lenses to know they really work.
  • Even if it works, this technique doesn’t mean you could have a universal charger. Every phone or tablet or what have you would still need its own, the researchers say, since the lens would be specifically designed to work with that particular device.

Reference: Yaroslav Urzhumov and David R. Smith. “Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer.” Physical Review B, May 18, 2011. DOI: 10.1103/PhysRevB.83.205114

Image: Flickr / C. G. P. Grey

CATEGORIZED UNDER: Physics & Math, Technology
  • N T Nair

    Every Technology Starts this Way. Let us give Time for it to mature. I am very Optimistic of its outcome

  • Jennifer Angela

    I love this idea! I totally approve of this theory and can´t wait for the practical outcome of it!

  • Bruce

    Hmmmm…… sounds like a nightmare for those sensitive to radiation. What’s wrong with a wall plug ?

  • Geack

    Can you define “sensitive to radiation”? And read the article – this is about focusing the energy so it goes where you want – much less likely to reach a person than the gazillion types of broadcast energy that everyone is harmlessly exposed to every day.

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