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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 | gigahertz | metamaterial | imaging | surface acoustic waves | time domain | ultrasonics |
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. |
Rights: | http://creativecommons.org/licenses/by/3.0/ |
Type: | article |
URI: | http://hdl.handle.net/2115/68375 |
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)
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Submitter: WRIGHT O. B.
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