Microlattice Metamaterials for Tailoring Ultrasonic Transmission with Elastoacoustic Hybridization

Sebastian Krödel and Chiara Daraio
Phys. Rev. Applied 6, 064005 – Published 9 December 2016
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Abstract

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.

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  • Received 4 April 2016

DOI:https://doi.org/10.1103/PhysRevApplied.6.064005

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sebastian Krödel1,† and Chiara Daraio2,*

  • 1Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH), 8092 Zürich, Switzerland
  • 2Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA

  • *Corresponding author. daraio@caltech.edu
  • skroedel@ethz.ch

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Issue

Vol. 6, Iss. 6 — December 2016

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