‘Bottled’ Sound Holds Promise for Imaging, Cloaking

August 5, 2014 1:29 PM

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‘Bottled’ Sound Holds Promise for Imaging, Cloaking

There’s a new wave of sound on the horizon carrying with it a broad scope of tantalizing potential applications, including advanced ultrasonic imaging and therapy, acoustic cloaking, levitation and particle manipulation. Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have developed a technique for generating acoustic bottles in open air that can bend the paths of sound waves along prescribed convex trajectories.

Sound waves move much like light waves. They travel on a straight path but this path – through reflection, diffraction or refraction – can be bent. This is the basis for ultrasound medical imaging and non-destructive testing of materials. An intense search has been underway in recent years to develo...

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