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Rotational mechanical effects driven by the transfer of the acoustic orbital angular momentum

Abstract : We study the rotational mechanical effects resulting from sound-matter interaction in the presence of orbital angular momentum transfer. A set of experimental realizations are implemented by using ultrasonic waves propagating in the air and 3D printed centimeter-sized objects acting as structured mirrors imparting a helical phase profile to the reflected wave. The main result consists of the quantitative direct measurement of the orbital angular momentum carried by acoustic vortex beams via two independent approaches. The first one is based on the use of a freely rotating helical mirror placed at air-water interface, and the second one relies on the development of a torsional mechanical oscillator driven by acoustic orbital angular momentum.
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Benjamin Sanchez Padilla. Rotational mechanical effects driven by the transfer of the acoustic orbital angular momentum. Physics [physics]. Université de Bordeaux, 2019. English. ⟨NNT : 2019BORD0452⟩. ⟨tel-02890688⟩

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