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Fig. 1 | Nano Convergence

Fig. 1

From: Acoustic wave science realized by metamaterials

Fig. 1

Effective mass density and bulk modulus diagram. v ph denotes the phase velocity. R and I indicate purely real and imaginary parts of phase velocity, respectively. Normal materials in nature belong to a with double positive parameters. Metamaterials can be classified as negative mass density (b), double negative parameters (c), negative bulk modulus (d) and near-zero mass density (e)

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