Abstract
Acoustic Meta-Engine In article number 2201575, Bin Liang, Jian-Chun Cheng, Johan Christensen, and co-workers report a metasurface-inspired compact motor that is capable of converting linear to angular momentum for audible and ultrasonic waves. With speed of up to 1000 rpm, noninvasive driving is made possible through appropriately designed momentum twisting, which opens the door to a new class of integrated mechanical devices solely powered by sound.
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