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Spin-orbit interactions of transverse sound

Author

Listed:
  • Shubo Wang

    (City University of Hong Kong)

  • Guanqing Zhang

    (Hong Kong Baptist University)

  • Xulong Wang

    (Hong Kong Baptist University)

  • Qing Tong

    (City University of Hong Kong)

  • Jensen Li

    (The Hong Kong University of Science and Technology)

  • Guancong Ma

    (Hong Kong Baptist University)

Abstract

Spin-orbit interactions (SOIs) endow light with intriguing properties and applications such as photonic spin-Hall effects and spin-dependent vortex generations. However, it is counterintuitive that SOIs can exist for sound, which is a longitudinal wave that carries no intrinsic spin. Here, we theoretically and experimentally demonstrate that airborne sound can possess artificial transversality in an acoustic micropolar metamaterial and thus carry both spin and orbital angular momentum. This enables the realization of acoustic SOIs with rich phenomena beyond those in conventional acoustic systems. We demonstrate that acoustic activity of the metamaterial can induce coupling between the spin and linear crystal momentum k, which leads to negative refraction of the transverse sound. In addition, we show that the scattering of the transverse sound by a dipole particle can generate spin-dependent acoustic vortices via the geometric phase effect. The acoustic SOIs can provide new perspectives and functionalities for sound manipulations beyond the conventional scalar degree of freedom and may open an avenue to the development of spin-orbit acoustics.

Suggested Citation

  • Shubo Wang & Guanqing Zhang & Xulong Wang & Qing Tong & Jensen Li & Guancong Ma, 2021. "Spin-orbit interactions of transverse sound," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26375-9
    DOI: 10.1038/s41467-021-26375-9
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    References listed on IDEAS

    as
    1. Shubo Wang & Bo Hou & Weixin Lu & Yuntian Chen & Z. Q. Zhang & C. T. Chan, 2019. "Arbitrary order exceptional point induced by photonic spin–orbit interaction in coupled resonators," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    2. Yang Long & Danmei Zhang & Chenwen Yang & Jianmin Ge & Hong Chen & Jie Ren, 2020. "Realization of acoustic spin transport in metasurface waveguides," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    3. S. B. Wang & C. T. Chan, 2014. "Lateral optical force on chiral particles near a surface," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    4. Tobias Frenzel & Julian Köpfler & Erik Jung & Muamer Kadic & Martin Wegener, 2019. "Ultrasound experiments on acoustical activity in chiral mechanical metamaterials," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    5. Michael B. Muhlestein & Caleb F. Sieck & Preston S. Wilson & Michael R. Haberman, 2017. "Experimental evidence of Willis coupling in a one-dimensional effective material element," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
    6. Konstantin Y. Bliokh & Daniel Leykam & Max Lein & Franco Nori, 2019. "Topological non-Hermitian origin of surface Maxwell waves," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    7. Nadège Kaina & Fabrice Lemoult & Mathias Fink & Geoffroy Lerosey, 2015. "Negative refractive index and acoustic superlens from multiple scattering in single negative metamaterials," Nature, Nature, vol. 525(7567), pages 77-81, September.
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    Cited by:

    1. Wei Chen & Wang Zhang & Yuan Liu & Fan-Chao Meng & John M. Dudley & Yan-Qing Lu, 2022. "Time diffraction-free transverse orbital angular momentum beams," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Jeseung Lee & Minwoo “Joshua” Kweun & Woorim Lee & Hong Min Seung & Yoon Young Kim, 2024. "Perfect circular polarization of elastic waves in solid media," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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