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

Journal Article · · New Journal of Physics
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [3];  [4];  [1]
  1. Hokkaido Univ., Sapporo (Japan)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States)
  4. 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
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (4)

2D Phononic Crystals: Progress and Prospects in Hypersound and Thermal Transport Engineering journal August 2019
Inertial amplified resonators for tunable metasurfaces journal July 2019
Perfect acoustic bandgap metabeam based on a quadruple-mode resonator array journal August 2019
Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances journal April 2019

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