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Acoustic directional radiation and enhancement caused by band-edge states of two-dimensional phononic crystals
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10.1063/1.2335975
/content/aip/journal/apl/89/6/10.1063/1.2335975
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/6/10.1063/1.2335975

Figures

Image of FIG. 1.
FIG. 1.

Band structure of PC consisting of steel cylinders in water, arranged by a square lattice. The inset represents relevant first Brillouin zone, with the high symmetric directions being marked. The frequency is normalized by , with being the lattice constant and being the sound velocity in water.

Image of FIG. 2.
FIG. 2.

(a) Schematic representation of 16-layer PC structure, with the crystal length along the direction being . (b) Unit cell of square lattice, with the positions of high symmetry being marked.

Image of FIG. 3.
FIG. 3.

(a) Far-field normalized energy-flux density vs angle, with the line acoustic source embedded in the center [at the position of point in the unit cell, see Fig. 2(b) ] of 2D PC consisting of cylinders. (b) The same as (a), but the source is moved downwards by [at the position of point in the unit cell, see Fig. 2(b) ]. (c) The same as (b), but with a four-layer substrate added. The optimal operating frequencies for the three designs are 0.6152, 0.6158, and 0.6155, respectively.

Image of FIG. 4.
FIG. 4.

Near-field amplitude distributions correspond to Figs. 3(a)–3(c) , with darkness and lightness representing strong and weak amplitudes of the displacement fields, respectively.

Tables

Generic image for table
Table I.

Radiation character parameters of DAS, including the number of radiation branches , optimal operating frequencies , total radiation enhancement factors , half-power angular widths around the direction, and relevant radiation efficiencies for those cases in Figs. 3(a)–3(c) , respectively.

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/content/aip/journal/apl/89/6/10.1063/1.2335975
2006-08-08
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Acoustic directional radiation and enhancement caused by band-edge states of two-dimensional phononic crystals
http://aip.metastore.ingenta.com/content/aip/journal/apl/89/6/10.1063/1.2335975
10.1063/1.2335975
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