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Time-domain imaging of gigahertz surface waves on an acoustic metamaterial

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Title: Time-domain imaging of gigahertz surface waves on an acoustic metamaterial
Authors: Otsuka, Paul H. Browse this author
Mezil, Sylvain Browse this author
Matsuda, Osamu Browse this author →KAKEN DB
Tomoda, Motonobu Browse this author →KAKEN DB
Maznev, Alexei A. Browse this author
Gan, Tian Browse this author
Fang, Nicholas Browse this author
Boechler, Nicholas Browse this author
Gusev, Vitalyi E. Browse this author
Wright, Oliver B. Browse this author →KAKEN DB
Keywords: acoustic
surface acoustic waves
time domain
Issue Date: 22-Jan-2018
Publisher: IOP Publishing
Journal Title: New Journal of Physics
Volume: 20
Start Page: 13026
Publisher DOI: 10.1088/1367-2630/aa9298
Abstract: We extend time-domain imaging in acoustic metamaterials to gigahertz frequencies. Using a sample consisting of a regular array of similar to 1 mu mdiameter silica microspheres forming a two-dimensional triangular lattice on a substrate, we implement an ultrafast technique to probe surface acoustic wave propagation inside the metamaterial area and incident on the metamaterial from a region containing no microspheres, which reveals the acoustic metamaterial dispersion, the presence of band gaps and the acoustic transmission properties of the interface. A theoretical model of this locally resonant metamaterial based on normal and shear-rotational resonances of the spheres fits the data well. Using this model, we show analytically how the sphere elastic coupling parameters influence the gap widths.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: WRIGHT O. B.

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