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Published December 2016 | Published + Supplemental Material
Journal Article Open

Microlattice Metamaterials for Tailoring Ultrasonic Transmission with Elastoacoustic Hybridization


Materials with designed microscale architectures, like microlattices, can achieve extreme mechanical properties. Most studies of microlattices focus on their quasistatic response, but their structural dimensions naturally prime them for ultrasonic applications. Here we report that microlattices constitute a class of acoustic metamaterials that exploit elastoacoustic hybridization to tailor ultrasonic wave propagation. Selecting the microlattice geometry allows the formation of hybridization band gaps that effectively attenuate (by >2 orders of magnitude) acoustic signals. The hybridization gaps stem from the interaction of pressure waves in a surrounding medium (e.g., water) with localized bending modes of the trusses in the microlattice. Outside these band gaps, the microlattices are highly transmissive (>80%) because their acoustic impedance is close to that of water. Our work can have important implications in the design of acoustic metamaterial applications in biomedical imaging, cell-based assay technology, and acoustic isolators in microelectromechanical systems.

Additional Information

© 2016 American Physical Society. (Received 4 April 2016; revised manuscript received 24 September 2016; published 9 December 2016) We acknowledge the help of Diana Courty for the nanoindentation measurements, Jean-Claude Tomasina for the construction of the ultrasonic tank, and Muamer Kadic for initial help in the numerical modeling. Funding for this research is provided by the Swiss National Science Foundation Grant "MechNanoTruss–Mechanical response of polymer nanotruss scaffolds" (Grant No. 164375). S. K. and C. D. conceived the idea. S. K. performed numerical simulations and designed and performed the experiments. S. K. and C. D. wrote the manuscript.

Attached Files

Published - PhysRevApplied.6.064005.pdf

Supplemental Material - 201610131_Kroedel_SI.pdf


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