摘要
对横向受限的一维固态声子晶体,得出了弹性波在其中传输时的模式数所满足的条件,并利用多层介质的转移矩阵计算了纵波入射时,不同模式下透射波的透射系数随弹性波频率变化的特点:出现声子禁带;不同模式的禁带宽度并不完全相同。横波入射时中心频率以下全为禁带,1倍中心频率以下没有透射峰出现。
Patterns of elastic wave in lateral limited solid phononic crystal are obtained. Transmission characteristics are studied by transfer matrix. For longitudinal wave incident, the phononic band-gap appears and the width of the band-gap is not always same for different patterns. On the other hand, when transverse wave incident, there is band-gap below the center frequency in the transmission and not transmission peak below the double center frequency.
基金
重庆市教委科技项目基金(KJ080720)
关键词
声子晶体
弹性波
转移矩阵
禁带
phononic crystal, elastic wave, transfer matrix, band-gap
