Coke cans focus sound waves beyond the diffraction limit

Tuesday, July 12, 2011 - 14:30 in Physics & Chemistry

( -- When trying to focus sound waves into as small an area as possible, scientists run into a fundamental limit called the diffraction limit. That is, when sound waves are focused into a region smaller than one wavelength, the waves begin to bend and spread out. Recently, scientists have designed complex acoustic metamaterial lenses in an attempt to overcome the diffraction limit, but now a new study shows that this can be done using much simpler materials - specifically, 49 empty Coke cans.

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