We could one day charge our phones and tablets wirelessly through the air, thanks to newly developed technology.
Researchers have used infrared laser light to transmit 400mW of light power over distances of up to 30 meters . That's enough juice to charge small sensors, though in time it could be developed to charge up larger devices such as smartphones too.
In the experimental setup, an amplifier transmitter specially treated with a silverywhite metal called erbium was set up 30 meters away from the receiver, which was outfiited with a photovoltaic cell to convert the light signal into electrical power. Part of that process could involve upgrading the photovoltaic cell in the receiver, so that it was able to convert more of the laser light into electricity. Another potential improvement could be making the setup work with multiple receivers at once.
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