Torsional Mechanical Oscillator Driven by the Orbital Angular Momentum of Sound
Résumé
We demonstrate that the orbital angular momentum of radiating waves can be used to drive a mechanical oscillator, an option that has remained elusive to date on experimental grounds whatever the nature of the waves. This is done using an amplitude-modulated ultrasonic wave interacting with a centimeter-size torsional pendulum. Achieved resonant quantitative measurements of the acoustic radiation torque and material properties set the basis for orbital-angular-momentum-based metrology applications and possibly cooling of the rotational degree of freedom of macroscopic objects.
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PRAppl 2020 (Torsional Mechanical Oscillator Driven by the Orbital Angular Momentum of Sound).pdf (5.71 Mo)
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