Elastic metamaterials with simultaneously negative effective shear modulus and mass density

Details Elastic metamaterials with simultaneously negative effective shear modulus and mass density Elastic metamaterials with simultaneously negative effective shear modulus and mass density

2011-02-23

arxiv.org/abs/1102.4679v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.107.105506

We propose a type of elastic metamaterial comprising fluid-solid composite inclusions which can possess negative shear modulus and negative mass density over a large frequency region. Such a solid metamaterial has a unique elastic property that only transverse waves can propagate with a negative dispersion while longitudinal waves are forbidden. This leads to many interesting phenomena such as negative refraction, which is demonstrated by using a wedge sample, and a significant amount of mode conversion from transverse waves to longitudinal waves that cannot occur on the interface of two natural solids.

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