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利用色散法研究了在入射角大于全反射角时弹性波在一维半无限周期声子晶体中的传输特性。结果发现当弹性波大于全反射角入射一维半无限周期声子晶体时出现了两级全反射隧穿导带;并得出了全反射隧穿导带随入射角和周期厚度的响应曲线,分析可知:导带的频率中心随入射角的增加而增加,随周期厚度的增加而降低;导带的频率宽度随入射角的增加而减小,随周期厚度的增加而降低。
The transmission characteristics of elastic wave in one-dimensional semi-infinite period phononic crystals at incident angle greater than total reflection angle were studied by dispersion method. The results show that when the elastic wave is more than the total reflection angle, one-dimensional half-infinite periodic phononic crystal is incident on the two-level total reflection tunneling conduction band. The response curve of total reflection tunneling conduction band with incident angle and period thickness is obtained, The analysis shows that the frequency center of the conduction band increases with the incident angle and decreases with the increase of the periodic thickness. The frequency width of the conduction band decreases with the incident angle and decreases with the increase of the periodic thickness.