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Abstract
We report on the modeling, fabrication, and characterization of an innovative design for a heterogeneous material consisting of spherical scatterers with asymmetric material distribution embedded in a thin viscoelastic layer. The material properties of the scatterers are uniformly oriented with respect to the layer thickness. The inclusions consists of unequal parts iron (Fe) and polyetheylene glycol (PEG) with non-uniform distribution of Fe within each inclusion to leading to coupling between monopole and dipole scattering response from individual Fe-PEG scatterers in the long wavelength limit when embedded in a polydimethylsiloxane (PDMS) matrix. Experiments were conducted from 0.5–1.5 MHz in an ultrasonic tank on two different samples.
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