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  • Letter

Transverse acoustic spin and torque from pure spinning of objects

M. Farhat1, P.-Y. Chen2, M. Amin3, A. Alù4,5, and Y. Wu1,*

  • 1Computer, Electrical, and Mathematical Science and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
  • 2Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA
  • 3College of Engineering, Taibah University, Madinah 42353, Saudi Arabia
  • 4Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA
  • 5Physics Program, Graduate Center, City University of New York, New York, New York 10016, USA

  • *ying.wu@kaust.edu.sa
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Phys. Rev. B 104, L060104 – Published 20 August, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L060104

Abstract

Acoustic spin has been recently explored for many applications. In particular, transverse acoustic spin was demonstrated for inhomogeneous acoustic fields. In this Letter, we show the emergence of acoustic spin and torque in rotating acoustic objects of the same physical properties as the surrounding, to single out the effects purely due to rotation. The spinning of a cylindrical column of air or water in the same medium possesses intrinsic spin angular momentum, and we study the torque and force it experiences in evanescent acoustic fields. The resulting discontinuity can thus scatter sound in unusual ways, including a negative radiation force, although it has no imaginary part in its parameters.

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Phys. Rev. B 104, L060104– Published 20 August, 2021
  • Received 5 March 2021
  • Revised 17 July 2021
  • Accepted 26 July 2021
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