Time-domain imaging of gigahertz surface waves on an acoustic metamaterial
Name
Otsuka_2018_New_J._Phys._20_013026.pdf
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1.96 MB
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Checksum (MD5)
5159518ba5467346c3f08b454a8a3855
Author(s)
Otsuka, Paul H
Mezil, Sylvain
Matsuda, Osamu
Tomoda, Motonobu
Boechler, Nicholas
Gusev, Vitalyi E
Wright, Oliver B
Maznev, Alexei
Gan, Tian
Fang, Xuanlai
Date Issued
January 2018
Journal
New Journal of Physics
Publisher
IOP Publishing
Citation
Otsuka, Paul H, Sylvain Mezil, Osamu Matsuda, Motonobu Tomoda, Alexei A Maznev, Tian Gan, Nicholas Fang, Nicholas Boechler, Vitalyi E Gusev, and Oliver B Wright. “Time-Domain Imaging of Gigahertz Surface Waves on an Acoustic Metamaterial.” New Journal of Physics 20, no. 1 (January 22, 2018): 013026.
Version
Final published version
Abstract
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. 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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/1367-2630/AA9298
