同时聚焦S0和A0兰姆模的梯度折射率器件
Gradient Index Devices for the Simultaneous Focusing of the S0 and A0 Lamb Modes
摘要：
梯度折射率器件的S 0和A 0兰姆模式的同时控制和数值分析。发现这两种模式的折射率之间存在一种特殊的关系，这种关系允许通过梯度声子晶体和板的厚度变化来同时控制这两种模式。设计了平面梯度折射率透镜和圆Luneburg透镜。数值模拟结果表明，这些设备的性能是良好的两个模式在宽带频率范围内，这种方法可以用来设计更先进的折射装置的引导振动模式的总控制。
英文摘要：
Gradient index devices for the simultaneous control of the S 0 and A 0 Lamb modes are presented and numerically analysed. It is found a special relationship between the refractive indexes for these two modes which allows their simultaneous control by means of graded phononic crystals and thickness variations of the plate. A flat gradient index lens and a circular Luneburg lens are designed. Numerical simulations show that the performance of these devices is good for the two modes in a broadband frequency region, and that this approach can be used to design more advanced refractive devices for the total control of guided vibrational modes.
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