Time-domain imaging of gigahertz surface waves on an acoustic metamaterial
- Hokkaido Univ., Sapporo (Japan)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of California, San Diego, La Jolla, CA (United States)
- Le Mans Univ., Le Mans (France)
We extend time-domain imaging in acoustic metamaterials to gigahertz frequencies. Using a sample consisting of a regular array of ~1 μm diameter 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. Here, 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.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-00ER15087
- OSTI ID:
- 1500099
- Journal Information:
- New Journal of Physics, Vol. 20, Issue 1; ISSN 1367-2630
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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