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