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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Acoustic multimode interference and self-imaging phenomena realized in multimodal phononic crystal waveguides
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Acoustic multimode interference and self-imaging phenomena realized in multimodal phononic crystal waveguides

机译：在多模态声子晶体波导中实现声多模干涉和自成像现象

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摘要

We report an acoustic multimode interference effect and self-imaging phenomena in an acoustic multimode waveguide system which consists of M parallel phononic crystal waveguides (M-PnCWs). Results show that the self-imaging principle remains applicable for acoustic waveguides just as it does for optical multimode waveguides. To achieve the dispersions and replicas of the input acoustic waves produced along the propagation direction, we performed the finite element method on M-PnCWs, which support M guided modes within the target frequency range. The simulation results show that single images (including direct and mirrored images) and N-fold images (N is an integer) are identified along the propagation direction with asymmetric and symmetric incidence discussed separately. The simulated positions of the replicas agree well with the calculated values that are theoretically decided by self-imaging conditions based on the guided mode propagation analysis. Moreover, the potential applications based on this self-imaging effect for acoustic wavelength de-multiplexing and beam splitting in the acoustic field are also presented.
机译：我们报告了由M个平行声子晶体波导（M-PnCWs）组成的声学多模波导系统中的声学多模干扰效应和自成像现象。结果表明，自成像原理仍然适用于声波导，就像适用于光学多模波导一样。为了实现沿传播方向产生的输入声波的色散和复制，我们在M-PnCW上执行了有限元方法，该方法在目标频率范围内支持M个引导模式。仿真结果表明，沿传播方向识别出单幅图像（包括直接图像和镜像图像）和N倍图像（N为整数），分别讨论了非对称和对称入射。副本的模拟位置与计算值非常吻合，计算值是理论上由基于引导模式传播分析的自成像条件决定的。此外，还介绍了基于这种自成像效应的潜在应用，可用于声场中的声波波长多路分解和分束。

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