复式BN结构固/气型声子晶体的带隙研究  

Study on the Band Gaps of Complex BN Lattice Phononic Crystals with Solid/Air System

作　　者：胡家光[1,2] 张晋[2] 敬守勇[3] 

机构地区：[1]文山师范高等专科学校数理系,文山663000 [2]云南大学物理科学技术学院,昆明650091 [3]深圳大学光电子学研究所,深圳518060

出　　处：《人工晶体学报》2009年第2期460-464,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金项目(No.10664006);云南省基础研究计划重点项目(No.2007A0017Z);文山师专校科研基金项目(No.08WSY06)

摘　　要：将复式BN结构引入固/气型声子晶体,其基元包含两个截面半径不同的圆柱体,三角格子和石墨结构作为BN结构的特殊情况被考虑在其中。用平面波法研究了其带隙结构,发现改变两圆柱体的截面半径比及填充率,就可调节声子晶体的带隙结构和范围,从而实现有选择性的滤波效应。此外,三角晶格容易在高填充率下获得高频宽带隙,而普通BN结构及石墨结构在低填充率条件下可获得低频宽带隙。The complex BN structure was drawn into solid/air system phononic crystals, their basis is composed of two steel cylinders with different section radius. The plane wave expansion method was applied to calculate band gap structures of the phononic crystals. The triangular and graphite lattices were also investigated as special cases. Numerical results show that the band gap structures and areas can be adjusted by altering the radius ratio and filling fraction of the two cylinders. Thus, we can filter elastic wave selective. In addition, the large band gaps with high frequency are easily achieved for triangular lattice at high filling fraction, while for the general BN and graphite lattices, the wide band gaps appear at low frequency with low filling fraction are also easy to be obtained.

关 键 词：声子晶体 能带结构 带隙 平面波法 

分 类 号：TB53[理学—物理]