• Open Access

Acoustic carpet cloak based on an ultrathin metasurface

Hussein Esfahlani, Sami Karkar, Herve Lissek, and Juan R. Mosig
Phys. Rev. B 94, 014302 – Published 1 July 2016

Abstract

An acoustic metasurface carpet cloak based on membrane-capped cavities is proposed and investigated numerically. This design has been chosen for allowing ultrathin geometries, although adapted to airborne sound frequencies in the range of 1 kHz (λ30 cm), surpassing the designs reported in the literature in terms of thinness. A formulation of generalized Snell's laws is first proposed, mapping the directions of the incident and reflected waves to the metasurface phase function. This relation is then applied to achieve a prescribed wavefront reflection direction, for a given incident direction, by controlling the acoustic impedance grading along the metasurface. The carpet cloak performance of the proposed acoustic metasurface is then assessed on a triangular bump obstacle, generally considered as a baseline configuration in the literature.

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  • Received 2 March 2016
  • Revised 19 May 2016

DOI:https://doi.org/10.1103/PhysRevB.94.014302

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsGeneral Physics

Authors & Affiliations

Hussein Esfahlani, Sami Karkar, and Herve Lissek*

  • Signal Processing Laboratory (LTS2), Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

Juan R. Mosig

  • Laboratory of Electromagnetics and Antenna (LEMA), Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

  • *herve.lissek@epfl.ch

Article Text

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Issue

Vol. 94, Iss. 1 — 1 July 2016

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