固-固掺杂结构声子晶体中弹性波的缺陷模

The defect model of the elastic wave in the 1D doping phononic crystal of solid-solid constitute

为了研究弹性波在固-固掺杂结构声子晶体中缺陷模的特性,推导出弹性波斜入射固-固掺杂结构声子晶体的转移矩阵。利用它计算了固-固掺杂结构声子晶体中弹性波的透射系数,得到由于掺杂在禁带的中间出现了多条缺陷模透射峰带,缺陷模透射峰带随杂质厚度的变化呈周期性地出现,在同一缺陷模透射峰带上缺陷模的频率随杂质厚度增加近似呈线性减少。缺陷模的这些特征可以作为设计声子晶体滤波器的理论依据。

In order to study defect model of elastic wave in solid-solid constitute doping phononic crystal, the transfer matrix of doping phononic crystal was inferred as the elastic wave oblique incidence. Trans- mission coefficient of elastic wave in the doping phononic crystal was calculated. It was found that there are several defect moldel in the forbidden band and the defect model varies with the doping thickness pe- riodically. In same defect model, the doping thickness increased with the frequency of defect model line- arly decreases. These characteristics of defect model can be used as the design of phononic crystal filter.