Research scientist Bogdan Popa with a 3D acoustic cloaking device constructed with components created in a 3-D printer (Photo: Duke Photography)
The acoustic cloak was constructed from several sheets of plastic plates dotted with repeating patterns of holes (Photo: Duke Photography)
Metamaterials are already being used to create invisibility cloaks and "temporal cloaks," but now engineers from Duke University have turned metamaterials to the task of creating a 3D acoustic cloak. In the same way that invisibility cloaks use metamaterials to reroute light around an object, the acoustic cloaking device interacts with sound waves to make it appear as if the device and anything hidden beneath it isn't there.
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