南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (1): 69–.
蓝 君1，李义丰1，2*
Lan Jun1，Li Yifeng1，2*
摘要： 以普通波导管内部嵌入弹性薄膜为基本单元结构，构造了零折射率声学超材料．研究表明，在频率为fm＝453.64 Hz时能实现等效质量密度为零的零折射率超材料．在零折射率超材料两端接上截面积较大的普通波导管构造了复合零折射率超材料，利用声传输线理论和声阻抗匹配理论，分析了该复合超材料中能量传输和轴向声压分布情况．理论和仿真结果表明：尽管在零折射率超材料与普通波导管之间存在极大的几何不匹配，系统在输入声波频率为fm和FabryPérot(FP)共振频率时能实现声波完全传输，且在频率fm处具有相位超耦合和传输增强等特性．除此之外，当改变复合超材料中零折射率超材料的长度D和弯曲角度θ时，发现其在频率为fm时所具有的特性不变，而FP共振频率的大小会随零折射率超材料长度的变化而改变．
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