Real-Life ‘Tractor Beam’ Can Levitate Objects Using Sound Waves

acoustic levitation using tractor beam
Researchers recently created an acoustic hologram, or a 3D sound field projected onto a 2D space, which can be used as acoustic tweezers, cages and twisters that manipulate objects as they levitate in air.
Credit: Image courtesy of Asier Marzo, Bruce Drinkwater and Sriram Subramanian © 2015

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