Abstract
The acoustic wave band structures and single defect states of thetwo-dimensional periodic composite media of water (mercury)cylinders with circular cross section in mercury (water) host wasstudied by using the plane-waves method and supercell calculations. Wefind that the numbers ofgaps in the first 50 bands versus the filling fraction have similar resultsas gap/midgap ratio of the lowest gap in the period systems. Only one band gapexhibits in the wide range of filling fraction, and several defect statesare created inside the band gaps in single defect systems. The influences ofthe filling fraction and defect radius on the band structure are investigated.
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