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Lego-like wall produces acoustic holograms

(Duke University) Research Triangle engineers have developed a simple, energy-efficient way to create three-dimensional acoustic holograms. By printing plastic blocks containing spirals of differing densities and stacking them in a calculated way, sound waves can be slowed by differing amounts and shaped to fit any wave-front wanted. The technique could revolutionize applications ranging from home stereo systems to medical ultrasound devices.
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Research Triangle engineers have developed a simple, energy-efficient way to create three-dimensional acoustic holograms. The technique could revolutionize applications ranging from home stereo systems to medical ultrasound devices.

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