https://www.hackster.io/news/metasurface-patterning-turns-ultrasonic-emitters-into-contact-free-tractor-beam-manipulators-e47f62ab01fc
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12/7/22 at 8:12pm
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Hackster.io
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Gareth Halfacree
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By turning objects into "metasurfaces," this contact-free system can not only push them away but pull them again too.
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