一维嵌套结构声子晶体透射特性  

Transmission characteristics of elastic wave through one-dimensional nesting complex structure phononic crystal

作　　者：胡家光[1,2] 徐文[2] 邱学云[1] 

机构地区：[1]文山学院数理系,云南文山663000 [2]云南大学物理科学技术学院,昆明650091

出　　处：《振动与冲击》2014年第2期183-187,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(10974206;11261049);云南省教育厅科研基金项目(2010Y093)

摘　　要：设计新型周期嵌套结构一维声子晶体,由采用传递矩阵法所得纵波与横波透射率谱图获得较传统一维晶格结构宽数倍的巨带隙与局域模。通过研究结构参数与带隙关系,获得有利于宽带隙产生条件及对局域模影响最大因素。通过控制掺杂材料厚度及位置,能较好实现局域模的精确调控,可显著增强声子晶体低频滤波效应。通过详述研究结果的物理机理,提出准缺陷耦合及缺陷共振等概念。A new nesting complex structure was designed to fabricate the one-dimensional phononic crystal. The transmissivity spectrograms of longitudinal and transverse waves through the phononic crystal were numerically calculated by using the transfer matrix method. The results show that the band gaps of the new phononic crystal are several times larger than those of the traditional one dimensional phonOnic crystal, and the local modes are present in the band gaps. The most effective factors to produce huge band gaps and to influence local modes were found out. The features of the local modes depend strongly on the thickness and location of impurities, and by modifying these parameters the accurate regulation of local modes can be better implemented, which can extend the filtering range of the phononic crystal to a lower frequency area. The mechanisms such as quasi-defect coupling and defects resonance were presented to explicate the results.

关 键 词：声子晶体 巨带隙 缺陷 透射谱 

分 类 号：TB53[理学—物理] O77[理学—声学]