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      Acoustic metamaterials: From local resonances to broad horizons

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          Abstract

          A review of the development of acoustic metamaterials, guided by their physical characteristics and novel functionalities.

          Abstract

          Within a time span of 15 years, acoustic metamaterials have emerged from academic curiosity to become an active field driven by scientific discoveries and diverse application potentials. This review traces the development of acoustic metamaterials from the initial findings of mass density and bulk modulus frequency dispersions in locally resonant structures to the diverse functionalities afforded by the perspective of negative constitutive parameter values, and their implications for acoustic wave behaviors. We survey the more recent developments, which include compact phase manipulation structures, superabsorption, and actively controllable metamaterials as well as the new directions on acoustic wave transport in moving fluid, elastic, and mechanical metamaterials, graphene-inspired metamaterials, and structures whose characteristics are best delineated by non-Hermitian Hamiltonians. Many of the novel acoustic metamaterial structures have transcended the original definition of metamaterials as arising from the collective manifestations of constituent resonating units, but they continue to extend wave manipulation functionalities beyond those found in nature.

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          Locally resonant sonic materials

          We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude smaller than the relevant wavelength. Disordered composites made from such localized resonant structures behave as a material with effective negative elastic constants and a total wave reflector within certain tunable sonic frequency ranges. A 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
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            Topological photonics

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              Optical negative-index metamaterials

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                Author and article information

                Journal
                Sci Adv
                Sci Adv
                SciAdv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                February 2016
                26 February 2016
                : 2
                : 2
                : e1501595
                Affiliations
                Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
                Author notes
                [* ]Corresponding author. E-mail: phmgc@ 123456ust.hk (G.M.); sheng@ 123456ust.hk (P.S.)
                Article
                1501595
                10.1126/sciadv.1501595
                4771441
                26933692
                2ffe1412-3275-47e0-94e7-633faf0e38a7
                Copyright © 2016, The Authors

                This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

                History
                : 06 November 2015
                : 22 December 2015
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100002920, Research Grants Council, University Grants Committee, Hong Kong;
                Award ID: ID0EIOAG5034
                Award ID: AoE/P-02/12
                Award Recipient :
                Categories
                Review
                Review
                SciAdv r-articles
                Acoustics
                Custom metadata
                Meann Ramirez

                metamaterials,acoustics,acoustic metamaterials,wave physics

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