Characteristics of the guided modes in a two-dimensional three-component phononic crystal with linear defects

A two-dimensional (2D) phononic crystal (PC), including a type of linear defect that is composed of third component materials, is proposed in this paper. The sonic guided characteristics of the structure are investigated by combining the plane-wave expansion method and a supercell technique. The res...

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Bibliographic Details
Published inPhysica scripta Vol. 85; no. 2; pp. 025401 - 4
Main Authors Yan-Cheng, Zhao, Lian-Zhi, Deng, Li-Bo, Yuan
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2012
Subjects
Cross sections
Crystal defects
Frequency distribution
Orientation
Rotational
Sonics
Symmetry
Two dimensional
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Summary:A two-dimensional (2D) phononic crystal (PC), including a type of linear defect that is composed of third component materials, is proposed in this paper. The sonic guided characteristics of the structure are investigated by combining the plane-wave expansion method and a supercell technique. The results show that there are guided modes in the original band gap when third material-based linear defects are introduced in the two-component PC. The frequency of the guided modes changes with the rotational angle and filling fraction of the linear defect. The frequency distribution is symmetric to the (0, 1) direction. The sonic waveguide characteristics of the PC do not change with the orientation and the type of cross-section of the defect cylinders when the filling fraction is very small. This property has potential application in controlling the guided modes in a 2D PC.
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ISSN:1402-4896
0031-8949
1402-4896
DOI:10.1088/0031-8949/85/02/025401