Journal
PHYSICA SCRIPTA
Volume 88, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0031-8949/88/02/025007
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Funding
- National Science foundation [60907034, 61077063, 11178010]
- China Postdoctoral Science Foundation [20100480965]
- Heilongjiang young researcher support project [1253G018, LBH-Z10195]
- Harbin Science foundation [2011RFLXG004]
- Fundamental Research Funds of the Central University, China
- Harbin Engineering University [B13015]
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In this paper, we study the complete and directional bandgap properties of two-dimensional mercury/air phononic crystals (PnCs) with L-shape scatters based on the plane wave expansion method combined with a parallel shift scheme. As the symmetry of the scatters is lower than the symmetry of a square lattice, we scan the whole first Brillouin zone when performing the calculation. The relationships between the parameters (including geometry and filling fraction) of L-shape scatters and bandgaps are simulated in detail. The complete bandgap could be gained at a very low filling fraction (even below 0.076). The bandgap and directional bandgap width could be adjusted widely by changing its geometry and rotating the L-shape scatters, which could be useful for applications such as an acoustic directional filter or acoustic isolator.
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