This acoustic cloak works in all the three dimensions of matter, which ever direction a sound is produced or coming from or where the observer is standing. It re-routes sound waves to make an impression that the cloak and anything below it are “not there”.
According to an ET report, The technology holds vast potential for future applications like a sonar avoidance and architectural acoustics, said the researchers. Steven Cummer, professor of electrical and computer engineering at Duke University said, "The particular trick we're performing is hiding an object from sound waves." The study is published in the Nature Materials journal.
While displaying the cloaking device, the researchers covered a small sphere with it and "pinged" it a intervals of short sound from different angles. They used a microphone to record how the waves responded and surpassed the set up, and further travelled through the air.
Cummer and his team developed the concept while working in the field of metamaterials, which is the combination of natural materials in repeating patterns to achieve un-natural properties. The materials are manipulated by the behaviour of sound waves, which are plastic and air. "By placing this cloak around an object, the sound waves behave like there is nothing more than a flat surface in their path," he said.
The device is as if many plastic plates in repeating pattern with holes poked through them and piled in form of a pyramid. "The structure that we built might look really simple," said Cummer. "But I promise you that it's a lot more difficult and interesting than it looks. We put a lot of energy into calculating how sound waves would interact with it. We didn't come up with this overnight."
According to an ET report, The technology holds vast potential for future applications like a sonar avoidance and architectural acoustics, said the researchers. Steven Cummer, professor of electrical and computer engineering at Duke University said, "The particular trick we're performing is hiding an object from sound waves." The study is published in the Nature Materials journal.
While displaying the cloaking device, the researchers covered a small sphere with it and "pinged" it a intervals of short sound from different angles. They used a microphone to record how the waves responded and surpassed the set up, and further travelled through the air.
Cummer and his team developed the concept while working in the field of metamaterials, which is the combination of natural materials in repeating patterns to achieve un-natural properties. The materials are manipulated by the behaviour of sound waves, which are plastic and air. "By placing this cloak around an object, the sound waves behave like there is nothing more than a flat surface in their path," he said.
The device is as if many plastic plates in repeating pattern with holes poked through them and piled in form of a pyramid. "The structure that we built might look really simple," said Cummer. "But I promise you that it's a lot more difficult and interesting than it looks. We put a lot of energy into calculating how sound waves would interact with it. We didn't come up with this overnight."
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