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Scientists Are Using ‘Metamaterials’ To Actually Build Wireless Phone Chargers And Invisibility Cloaks

SINGAPORE (Reuters) – A new way of assembling things, called metamaterials, may in the not too distant future help to protect a building from earthquakes by bending seismic waves around it. Similarly, tsunami waves could be bent around towns, and soundwaves bent around a room to make it soundproof.

While the holy grail of metamaterials is still to make objects and people invisible to the eye, they are set to have a more tangible commercial impact playing more mundane roles – from satellite antennas to wirelessly charging mobile phones.

Metamaterials are simply materials that exhibit properties not found in nature, such as the way they absorb or reflect light. The key is in how they’re made. By assembling the material – from photonic crystals to wire and foam – at a scale smaller than the length of the wave you’re seeking to manipulate, the wave can, in theory, be bent to will.

This makes metamaterials the tool of choice for scientists racing to build all sorts of wave-cloaking devices, including the so-called invisibility cloak – a cover to render whatever’s inside effectively invisible by bending light waves around it.

“The invisibility cloak was just one more thing we were discovering – that we have all this flexibility in this material and here’s another thing we can do,” David Smith of Duke University, widely regarded as one of the founding fathers of metamaterials, said in a telephone interview. “But we’re equally interested in seeing this transition in making a difference in people’s lives.”
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