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Observation of elastic spin with chiral meta-sources

Author

Listed:
  • Weitao Yuan

    (Tongji University
    Tongji University)

  • Chenwen Yang

    (Tongji University)

  • Danmei Zhang

    (Tongji University)

  • Yang Long

    (Tongji University)

  • Yongdong Pan

    (Tongji University)

  • Zheng Zhong

    (Tongji University)

  • Hong Chen

    (Tongji University)

  • Jinfeng Zhao

    (Tongji University)

  • Jie Ren

    (Tongji University)

Abstract

Directional routing of one-way classical wave has raised tremendous interests about spin-related phenomena. This sparks specifically the elastic wave study of pseudo-spin in meta-structures to perform robust manipulations. Unlike pseudo-spin in mathematics, the intrinsic spin angular momentum of elastic wave is predicted quite recently which exhibits selective excitation of unidirectional propagation even in conventional solids. However, due to the challenge of building up chiral elastic sources, the experimental observation of intrinsic spin of elastic wave is still missing. Here, we successfully measure the elastic spin in Rayleigh and Lamb modes by adopting elaborately designed chiral meta-sources that excite locally rotating displacement polarization. We observe the unidirectional routing of chiral elastic waves, characterize the different elastic spins along different directions, and demonstrate the spin-momentum locking in broad frequency ranges. We also find the selective one-way Lamb wave carries opposite elastic spin on two plate surfaces in additional to the source chirality.

Suggested Citation

  • Weitao Yuan & Chenwen Yang & Danmei Zhang & Yang Long & Yongdong Pan & Zheng Zhong & Hong Chen & Jinfeng Zhao & Jie Ren, 2021. "Observation of elastic spin with chiral meta-sources," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27254-z
    DOI: 10.1038/s41467-021-27254-z
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    1. 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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