标题： 二维浅空腔缺陷声子晶体中的表面声波模式 显示英文标题

标题： Surface acoustic wave modes in two-dimensional shallow void inclusion phononic crystals on GaAs

摘要： 二维声子晶体中表面声波的研究，该声子晶体由浅层、深约两到三微米的圆柱形空洞排列成正方形阵列，通过有限元方法进行计算。 对于(001) GaAs半空间上的[110]传播方向，常规的瑞利波模式、与分层基底相关的塞扎瓦和兰姆模式、高频纵向表面波和体波表现出杂化和模态相互作用。 纵向、垂直剪切和水平剪切体波的色散被观察到是浅层声子晶体上表面声波的重要阈值。 这导致了衰减和表面束缚性质的显著变化，从而在原本主要是体波辐射色散分支连续体的模式中实现了衰减减小的超音速模式。 显示英文摘要

摘要： Surface acoustic waves in two-dimensional phononic crystals consisting of a square array of shallow, two to three micron deep cylindrical void inclusions are studied computationally via the finite element method. For the [110] propagation direction on a (001) GaAs half-space, the conventional Rayleigh wave modes, the layered substrate-associated Sezawa and Lamb modes, the high frequency longitudinal surface waves and bulk waves exhibit hybridization and modal interaction. The longitudinal, vertical shear and horizontal shear bulk wave dispersions are observed to be significant thresholds for surface acoustic waves on a shallow phononic crystal. This results in dramatic changes in the attenuation and surface boundedness properties that enable supersonic modes with diminished attenuation in otherwise largely bulk wave-radiative dispersion branch continua of modes.