Acoustic Holograms Form Ultrasonic Tractor Beams for Tiny Objects – IEEE Spectrum

https://www.youtube.com/watch?v=s5r2nmvxA4sFor the first time, objects can be moved and spun in midair using a single ultrasonic array

Source: Acoustic Holograms Form Ultrasonic Tractor Beams for Tiny Objects – IEEE Spectrum

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