The effects of point defects on transmission coefficients in two-dimensional piezoelectric phononic crystals |
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| Authors: | LI Jin-qiang LI Feng-ming Kikuo Kishimoto CHEN Zhao-bo and WANG Yue-sheng |
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| Affiliation: | [1]School of Astronautics, Harbin Institute of Technology, Harbin 150001, China [2]Dept. of Mechanical Sciences and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan [3]School of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, China [4]Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | Based on finite-difference time-domain (FDTD) method, the wave propagation and localization in two-dimensional defect-containing piezoelectric phononic crystals are investigated when the mechanical-electrical coupling is taken into account.The characteristics of localized defect modes are studied, and the effects of the number and direction of defects on the defect modes and transmission coefficients are discussed.Numerical resuhs of defect modes and transmission coefficients are presented for BaTiO3/polymer piezocomposite, and from which we can see that the number and direction of defects have pronounced effects on the defect modes and transmission coefficients.The results also show the existence of elastic wave localization in piezoelectric phononic crystals containing defects. |
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| Keywords: | piezoelectricity phononic crystal localized defect mode FDTD method |
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