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Schematic representation of the cavity consisting of four layers for the front crystal and six layers for the back crystal.
Transmission spectra of the cavity structure, where the frequency is normalized by , with the lattice constant and the sound velocity in water.
(a) The near-field amplitude distribution with a line acoustic source placed in the cavity at a normalized frequency of 0.606. (b) Corresponding far-field amplitude distributions, but normalized by that of a line acoustic source with the same amplitude freely radiating in the homogeneous matrix medium (water). The lightness and darkness, respectively, denote strong and weak amplitude distributions of displacement field.
The far-field normalized energy-flux density along the direction.
The far-field normalized energy-flux density versus angle.
Half-power angular width versus the crystal length .
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