Figure 4.


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(a) The real and imaginary parts of the acoustic index n (= n′ + in″) of an acoustic metafluid with different volume fractions Φ of soft porous silicone micro-beads with a mean radius of 160 μm and a size dispersion of 25%. (b) Corresponding figures of merit (FOM) are defined as the ratio |n′/n″|.

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