Metamaterials give sound a twist

By Ashley Yeager, 17:02 PM February 26, 2014

Metamaterials, known for their ability to create invisibility cloaks, can now twist sound in weird ways.

The design of the acoustic rotator allows researchers to rotate a wave at precise angles so that it originates from the opposite direction. Rotating sound waves in this way would bump up the contrast in the ultrasound devices and improve imaging of damaged tissue, scientists suggest February 25 in Applied Physics Letters.

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