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声学斯格明子模式是一种在声学结构表面产生的速度场矢量拓扑纹理结构，这种受保护的矢量分布为先进的声音信息处理、传输和数据存储提供了新的维度.在本文中，我们设计了一种波导和螺旋结构的组合结构，利用定向声源激发波导模式传输进而实现对局域型声学斯格明子模式的选择性激发.通过理论分析和数值仿真，我们研究了自旋声源，Huygens声源，Janus声源在此结构中激发的压力场分布以及速度场分布，展示了组合结构中声表面波的定向传输性质和选择性激发的声学斯格明子模式.这种波导激发方式是一种激发声学斯格明子模式的新手段，使得声学斯格明子模式的激发更加灵活.并且这种波导激发的方式在更复杂和更大规模的声学系统中有着重要的应用潜力，研究结果可能促进对声学近场物理的对称性理解，为利用声波操控粒子开辟新的路径，还可能为设计先进声学器件开辟新途径.Acoustic skyrmion modes are topological texture structures of velocity field vectors generated on the surface of acoustic structures. This protected vector distribution provides new dimensions for advanced sound information processing, transmission, and data storage. In this study, we design a combined structure of waveguides and spiral structures, using directional acoustic sources to excite waveguide mode transmission, thereby achieving selective excitation of localized acoustic skyrmion modes. Through theoretical analysis and numerical simulations, we studied the pressure field distribution and velocity field distribution excited by spin acoustic sources, Huygens acoustic sources, and Janus acoustic sources in this structure, demonstrating the directional transmission properties of acoustic surface waves and the selectively excited acoustic skyrmion modes in the combined structure. Numerical calculations reveal that when the spin acoustic source excites acoustic surface waves to propagate directionally along the waveguide, it selectively excites the acoustic skyrmion modes in the helical structure in the direction corresponding to the propagation. When the Huygens source excites acoustic surface waves to propagate directionally along the waveguide, it selectively excites acoustic skyrmion modes in the right or left direction. However, when the Janus source excites acoustic surface waves propagating directionally along the waveguide, it will selectively excite acoustic skyrmion modes in the upward or downward direction. This waveguide excitation method is a new means of exciting acoustic skyrmion modes, making the excitation of acoustic skyrmion modes more flexible. Moreover, this waveguide excitation method has significant application potential in more complex and larger-scale acoustic systems. The research results may promote the understanding of the symmetry in acoustic near-field physics, opening new pathways for using sound waves to manipulate particles, and potentially paving the way for the design of advanced acoustic devices.
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