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Letter

Nature Materials 5, 452–456 (1 June 2006) | doi:10.1038/nmat1644

Ultrasonic metamaterials with negative modulus

Nicholas Fang , Dongjuan Xi , Jianyi Xu , Muralidhar Ambati , Werayut Srituravanich , Cheng Sun & Xiang Zhang

The emergence of artificially designed subwavelength electromagnetic materials, denoted metamaterials, has significantly broadened the range of material responses found in nature. However, the acoustic analogue to electromagnetic metamaterials has, so far, not been investigated.