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Acoustic Focusing and Energy Confinement Based on Multilateral Metasurfaces

Shuibao Qi1,2, Yong Li1,2,*, and Badreddine Assouar1,2,†

  • 1CNRS, Institut Jean Lamour, Vandœuvre-lès-Nancy F-54506, France
  • 2Université de Lorraine, Institut Jean Lamour, Boulevard des Aiguillettes, BP: 70239, Vandœuvre-lès-Nancy 54506, France

  • *yong.li@univ-lorraine.fr
  • †Badreddine.Assouar@univ-lorraine.fr
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Phys. Rev. Applied 7, 054006 – Published 12 May, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.7.054006

Abstract

Metamaterial-based acoustic wave manipulation shows great potential in effective acoustic energy confinement and low-frequency acoustic isolation. We numerically and theoretically propose here a concept based on multilateral metasurfaces for reflected acoustic focusing and energy confinement. The theoretical phase-shift profile required for reflected wave focusing and governed by the generalized Snell’s law can be discretely realized by appropriately arraying the labyrinthine units in the right sequences. Based on this design, multilateral metasurfaces for acoustic wave focusing and energy confinement under point-source incidence are considered and sufficiently investigated. The coupling effects and multiple reflections between or among metasurfaces, which play a significant role in the energy confinement, are initially analyzed and discussed. We show that the acoustic focusing and confinement increase with the sides of the multilateral metasurfaces as anticipated. In addition to the contribution of the first reflection, multiple reflections also contribute to the acoustic focusing and energy confinement, especially when the metasurfaces are configured in parallel. The proposed multilateral metasurfaces should have excellent performance in acoustic energy confinement in various situations due to the variable designs and strong acoustic focusing capabilities.

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Phys. Rev. Applied 7, 054006– Published 12 May, 2017
  • Received 8 November 2016

© 2017 American Physical Society

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