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Directional acoustic source based on the resonant cavity of two-dimensional phononic crystals
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic representation of the cavity consisting of four layers for the front crystal and six layers for the back crystal.

Image of FIG. 2.
FIG. 2.

Transmission spectra of the cavity structure, where the frequency is normalized by , with the lattice constant and the sound velocity in water.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

The far-field normalized energy-flux density along the direction.

Image of FIG. 5.
FIG. 5.

The far-field normalized energy-flux density versus angle.

Image of FIG. 6.
FIG. 6.

Half-power angular width versus the crystal length .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Directional acoustic source based on the resonant cavity of two-dimensional phononic crystals