不同参数声子晶体第一完全带隙影响因素研究

Study on the Factor Parameters of the First Complete Band Gap in Phononic Crystal

基于时域有限差分法研究了二维声子晶体的第一完全带隙,数值计算了不同基体和散射体参数下XY模式的带隙特性。结果表明随着散射体与基体密度比的增大,第一完全带隙增宽。同时研究了不同晶格结构参数和填充率参数对第一完全带隙的影响,三角晶格的填充率高于正方晶格,较宽的带隙范围。研究结论为声子晶体器件的设计提供理论依据。

.The first complete band gap of two-dimensional phononic crystal were studied based on the plane wave expansion method, and XY mode band gap characteristics of different matrix and scattering parameters were simulated. The results show that the first complete band gaps can be improved with increasing the ratio of the density between the scatter and of matrix. The relationship between the different parameters for the lattice structure and the filling ratio were also studied. The filling rate of the triangular lattice is higher than the square lattice, so the wider band gap was achieved for the triangular lattice. These results provide theoretical basis for the design of phononic crystal devices.