摘要
基于平面波展开法,研究了水-四氯化碳/水银和四氯化碳-水/水银两种体系的二维三组元结构的声波带隙,结果表明,在相同填充率下,圆柱形插入体比正方柱形插入体更易得到较高频率范围内的完全带隙;无论插入体的形状为方柱或圆柱,第一带隙相对宽度的变化都是稳定的,但对第二带隙相对宽度的影响较大;圆柱形插入体的第一完全带隙的相对宽度变窄的速率比正方形插入体的快。该文提出通过散射体横切面积的几何形状来控制带隙频率。这对设计液体系统的声子晶体有实际意义。
Based on the plane wave expansion method (PWE), sonic wave hand gaps in the two-dimensional three-component phononic crystals composed of square array of tetrachloromethane square columns(cylinders) coa- ted by water layers embedded in a mercury host are investigated. The calculation results show that the cylinders more easily get higher frequency band gaps than square rods do at the same filling fraction. The calculations also ex- hibit that whether the shape of the scatters is square columns or cylinders, the relative bandwidth of the first gap is stable,but the relative width of the second gap is greatly influenced by the shape of the scatters. The relative band- width of the first gap with square becomes narrower than that with circular. It is suggested that the frequencies o{ the band gaps can be controlled by the shape of the scattering objects. This could be of importance in designing pho- nonic crystals of liquid systems and finding their optimum operation conditions.
出处
《压电与声光》
CAS
CSCD
北大核心
2014年第4期509-514,共6页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(11264022)
昆明市引进创新创业人才项目"五五一"计划基金资助项目(201302)
关键词
声子晶体
平面波展开法
弹性波
带隙
三组元
phononic crystals
plane wave expansion method
elastic wave
band gaps
three-component