摘要
用平面波法计算了截面形状分别为圆、椭圆和正四棱形的铝合金柱体在空气中按正方格子排列形成二维声子晶体的带隙结构。结果表明:截面形状不同的散射体会产生不同的带隙结构;三种体系的声子晶体都只有在填充率F大于一定数值时才会出现完全带隙,并且第一完全带隙宽度都随着F的增大而单调增加,当F达到最大时,增加到极值;在F<0.5时,正四棱柱/空气体系声子晶体最有利于产生宽带隙,而当F>0.5时,圆柱体/空气体系声子晶体带隙最宽。
The plane wave algorithm was employed to calculate aluminum alloy / air phononic crystals with three different shapes band gap structures of two-dimensional of scatterers. The aluminum alloy were cylinders, elliptical cylinders and regular quadrilateral prisms in square lattice arrays, respectively. It could be concluded that different band gap structures crystals;the absolute band gaps are obtained only when are achieved for the three types of phononic the filling fraction F is more than a particular number to each of the phononic crystals, the width of their first band gaps enlarge monotonously with F increase and the maximum gaps are attained when F are up to the maximum ; when F 〈 0. 5, the regular quadrilateral prisms / air system is the most easy to win large band gaps than others, while F 〉 0.5, the cylinders / air system reveals the maximum band gaps.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2007年第3期554-558,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金资助项目(No.60261004
No.60361001
No.10664006)
北京市传感器重点实验室开放课题(No.66062022)
关键词
声子晶体
带隙
散射体
平面波法
phononic crystal
band gap
scatterer
plane wave algorithm
