微球接触共振与声表面波的相互作用
Interaction of a Contact Resonance of Microspheres with Surface Acoustic Waves
摘要：
研究了表面声波与1 μm二氧化硅微球的轴向振动共振相互作用。采用激光感生瞬态光栅技术激发声表面波并测量其色散。测量的色散曲线表现出“避免交叉”的行为，由于杂交的SAW微球共振。我们比较了测量的色散曲线与我们的分析模型预测，并找到很好的协议。所提出的方法可用于研究微米和纳米颗粒的接触力学和粘附以及微尺度颗粒晶体的动力学。
英文摘要：
We study the interaction of surface acoustic waves (SAWs) with the contact-based, axial vibrational resonance of 1 μm silica microspheres forming a two-dimensional granular crystal adhered to a substrate. The laser-induced transient grating technique is used to excite SAWs and measure their dispersion. The measured dispersion curves exhibit "avoided crossing" behavior due to the hybridization of the SAWs with the microsphere resonance. We compare the measured dispersion curves with those predicted by our analytical model, and find excellent agreement. The approach presented can be used to study the contact mechanics and adhesion of micro- and nanoparticles as well as the dynamics of microscale granular crystals.
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