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可调控的局域声场在开发新型滤波器、传感器和声操控微器件等方面具有潜在应用前景。文章数值模拟研究了一种二维正方排列含缺陷孔声子晶体孔板表面的局域声场。计算结果表明,选择不同的共振频率可以调控含缺陷声子晶体孔板表面的声场形态。这是因为缺陷孔与周期孔的Fabry-Perot共振频率不一致,导致含缺陷声子晶体孔板表面的耦合场有多种形态。该工作所设计的缺陷态声子晶体孔板,可为声场与微粒的精细相互作用研究提供声学载台。
The controllable local sound field has potential applications in the development of new filters, sensors and sound manipulation micro-devices. In this paper, we study the local acoustic field on the surface of a two-dimensional square-array phonon crystal plate with defects. The results show that different resonance frequencies can be used to control the sound field on the surface of the phonon crystal plate with defects. This is because the Fabry-Perot resonance frequency of the defect hole and the periodic hole is not uniform, resulting in a variety of configurations of the coupling field on the surface of the phosphor-containing phonon crystal plate. The designed phononic crystal plate with defect state can provide the acoustic platform for the fine interaction between sound field and particle.