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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...
An ultrasonic motor built with a contactless meta engine block (MEB) is designed and experimentally demonstrated for twisting the linear momentum of sound emanating from a Helmholtz resonator‐based metasurface into orbital angular momentum (OAM). The MEB is capable of hosting highly efficient excitations of eigenmodes carrying desired OAM whose Bessel acoustic intensity patterns are enhanced by over...
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