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Imaging gigahertz zero-group-velocity Lamb waves

Author

Listed:
  • Qingnan Xie

    (Nanjing University of Science and Technology)

  • Sylvain Mezil

    (Hokkaido University)

  • Paul H. Otsuka

    (Hokkaido University)

  • Motonobu Tomoda

    (Hokkaido University)

  • Jérôme Laurent

    (CNRS)

  • Osamu Matsuda

    (Hokkaido University)

  • Zhonghua Shen

    (Nanjing University of Science and Technology)

  • Oliver B. Wright

    (Hokkaido University)

Abstract

Zero-group-velocity (ZGV) waves have the peculiarity of being stationary, and thus locally confining energy. Although they are particularly useful in evaluation applications, they have not yet been tracked in two dimensions. Here we image gigahertz zero-group-velocity Lamb waves in the time domain by means of an ultrafast optical technique, revealing their stationary nature and their acoustic energy localization. The acoustic field is imaged to micron resolution on a nanoscale bilayer consisting of a silicon-nitride plate coated with a titanium film. Temporal and spatiotemporal Fourier transforms combined with a technique involving the intensity modulation of the optical pump and probe beams gives access to arbitrary acoustic frequencies, allowing ZGV modes to be isolated. The dispersion curves of the bilayer system are extracted together with the quality factor Q and lifetime of the first ZGV mode. Applications include the testing of bonded nanostructures.

Suggested Citation

  • Qingnan Xie & Sylvain Mezil & Paul H. Otsuka & Motonobu Tomoda & Jérôme Laurent & Osamu Matsuda & Zhonghua Shen & Oliver B. Wright, 2019. "Imaging gigahertz zero-group-velocity Lamb waves," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10085-4
    DOI: 10.1038/s41467-019-10085-4
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    Cited by:

    1. Lei Shao & Vikrant J. Gokhale & Bo Peng & Penghui Song & Jingjie Cheng & Justin Kuo & Amit Lal & Wen-Ming Zhang & Jason J. Gorman, 2022. "Femtometer-amplitude imaging of coherent super high frequency vibrations in micromechanical resonators," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Daehun Lee & Shahin Jahanbani & Jack Kramer & Ruochen Lu & Keji Lai, 2023. "Nanoscale imaging of super-high-frequency microelectromechanical resonators with femtometer sensitivity," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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