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Physicists generated sound waves that travel in one direction only
A new way to create silence.
The device, developed by scientists at ETH Zurich and the Swiss Federal Institute of Technology Lausanne, is made up of a disk-shaped cavity with three equally-spaced ports that can each send or receive sound. "This concept of loss-compensated non-reciprocal wave propagation is, in our view, an important result that can also be transferred to other systems," says senior researcher Nicolas Noiray. To return to the analogy from earlier, two people in a room conversing at the same volume with no obstacles between them can hear each other clearly as the sound waves move freely in both directions.
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