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TOPOLOGICAL METAMATERIALS

Trapping sound at corners

Nature Materials volume 18, pages 98–99 (2019)Cite this article

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Higher-order topological acoustic metamaterials on kagome lattices, which host topologically protected corner states, can confine sound at corners. This may lead to applications of acoustic metamaterials in local acoustic field enhancement, trapping and manipulating of particles, and acoustic sensing and probing.

The manipulation of light and sound, which is important in many aspects of everyday life, is at the core of the field of metamaterials. Metamaterials are ‘designed’ artificial structures, with desired ‘engineered’ band structures, that enable the flexible control of waves. Both the pass bands and the forbidden bands (bandgaps) of metamaterials can be employed in wave manipulations. For example, by taking advantage of the pass bands of negative group velocity, negative refraction can be realized1. Bandgaps are usually used to block or confine waves. By creating defects, such as point, line or plane defects in metamaterials, localized cavity states or guiding states can be induced at or along the defects with their frequency lying in the bandgap. Localized states can also exist on the boundaries of metamaterials in the bandgaps. However, all these states, despite their appearance, are not robust against disorders or imperfections, which means that the modes could be scattered or disturbed, or even unable to survive.

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Fig. 1: Second-order topological acoustic metamaterials on a kagome lattice.

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Authors and Affiliations

  1. School of Physics and Technology, Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education, Institute for Advanced Studies, Wuhan University, Wuhan, China

    Zhengyou Liu

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  1. Zhengyou Liu
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Correspondence to Zhengyou Liu.

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Liu, Z. Trapping sound at corners. Nature Mater 18, 98–99 (2019). https://doi.org/10.1038/s41563-018-0274-3

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  • DOI: https://doi.org/10.1038/s41563-018-0274-3

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