论文标题
声学散射中的远场和近场方向性
Far-field and near-field directionality in acoustic scattering
论文作者
论文摘要
Far-field directional scattering and near-field directional coupling from simple sources have recently received great attention in photonics: beyond circularly-polarized dipoles, whose directional coupling to evanescent waves was recently applied to acoustics, the near-field directionality of modes in optics includes phased combinations of electric and magnetic dipoles, such as the Janus dipole and the Huygens dipole, both of which have been使用高折射率纳米颗粒实验实现。在这项工作中，我们将其扩展到声学：我们提出了使用高声指数散射器的使用，这些散射器表现出具有远场和近场方向性的声学单极和偶极子的分阶段组合。所有溶液均源于声源的优雅声学谱，与电磁词相似。提出了一个具有零向后散射的Huygens声源，并在数值上证明了零，以及一个janus源，可实现面部选择性和位置依赖性的evanscent耦合到附近的声学波导。
Far-field directional scattering and near-field directional coupling from simple sources have recently received great attention in photonics: beyond circularly-polarized dipoles, whose directional coupling to evanescent waves was recently applied to acoustics, the near-field directionality of modes in optics includes phased combinations of electric and magnetic dipoles, such as the Janus dipole and the Huygens dipole, both of which have been experimentally implemented using high refractive index nanoparticles. In this work we extend this to acoustics: we propose the use of high acoustic index scatterers exhibiting phased combinations of acoustic monopoles and dipoles with far-field and near-field directionality. All solutions stem from the elegant acoustic angular spectrum of the acoustic source, in close analogy to electromagnetism. A Huygens acoustic source with zero backward scattering is proposed and numerically demonstrated, as well as a Janus source achieving face-selective and position-dependent evanescent coupling to nearby acoustic waveguides.
