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Fig. 6 | Nano Convergence

Fig. 6

From: Acoustic wave science realized by metamaterials

Fig. 6

ac are adapted from [41]

a Membrane-type pipe. Membranes are inserted in each lattice constant d which is 7 cm, resulting in the negative mass density. b Helmholtz-type pipe. Side holes are inserted in series with lattice constant d, resulting in the negative bulk modulus. c Both membranes and side holes are inserted together, resulting in the negative phase velocity.

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