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Water-based metamaterials

Negative refraction of sound

Nature Materials volume 14, pages 363–364 (2015)Cite this article

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Porous rubber microbeads suspended in a gel are found to exhibit a negative acoustic index of refraction, which makes these metamaterials promising for underwater acoustic applications.

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Figure 1: Metafluids with negative index of refraction.

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Authors and Affiliations

  1. Bogdan-Ioan Popa and Steven A. Cummer are in the Electrical and Computer Engineering Department, Duke University, Durham, North Carolina 27705, USA,

    Bogdan-Ioan Popa & Steven A. Cummer

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  1. Bogdan-Ioan Popa
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  2. Steven A. Cummer
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Correspondence to Bogdan-Ioan Popa or Steven A. Cummer.

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Popa, BI., Cummer, S. Negative refraction of sound. Nature Mater 14, 363–364 (2015). https://doi.org/10.1038/nmat4253

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