We report the design and characterization of a self-assembled, locally resonant acoustic metamaterial for Lamb waves, composed of a monolayer of 1.02 μm polystyrene microspheres adhered to a 1.27 μm thick free-standing silicon membrane. A laser-induced transient grating technique is used to generate Lamb waves in the metamaterial and to measure its acoustic response. The measurements reveal a microsphere contact resonance and the lowest frequency spheroidal microsphere resonance. The measured dispersion curves show hybridization of flexural Lamb waves with the microsphere contact resonance. We compare the measured dispersion with an analytical model using the contact resonance frequency as a single fitting parameter, and find that it well describes the observed hybridization. This study may lead to an improved understanding of microscale contact mechanics and to the design of new types of acoustic metamaterials.
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17 August 2015
Research Article|
August 17 2015
A self-assembled metamaterial for Lamb waves
A. Khanolkar
;
A. Khanolkar
1Department of Mechanical Engineering,
University of Washington
, Seattle, Washington 98195, USA
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S. Wallen
;
S. Wallen
1Department of Mechanical Engineering,
University of Washington
, Seattle, Washington 98195, USA
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M. Abi Ghanem;
M. Abi Ghanem
1Department of Mechanical Engineering,
University of Washington
, Seattle, Washington 98195, USA
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J. Jenks;
J. Jenks
1Department of Mechanical Engineering,
University of Washington
, Seattle, Washington 98195, USA
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N. Vogel;
N. Vogel
2
Institute of Particle Technology and Cluster of Excellence Engineering of Advanced Materials, Friedrich-Alexander-University
Erlangen-Nuremberg, 91058 Erlangen, Germany
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N. Boechler
N. Boechler
1Department of Mechanical Engineering,
University of Washington
, Seattle, Washington 98195, USA
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Appl. Phys. Lett. 107, 071903 (2015)
Article history
Received:
May 13 2015
Accepted:
August 01 2015
Connected Content
A correction has been published:
Erratum: “A self-assembled metamaterial for Lamb waves” [Appl. Phys. Lett. 107, 071903 (2015)]
Citation
A. Khanolkar, S. Wallen, M. Abi Ghanem, J. Jenks, N. Vogel, N. Boechler; A self-assembled metamaterial for Lamb waves. Appl. Phys. Lett. 17 August 2015; 107 (7): 071903. https://doi.org/10.1063/1.4928564
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