基于定向声源的局域型声学斯格明子模式的选择性激发  

Selective excitation of localized acoustic skyrmion modes based on directional sound sources

作　　者：张孝悦 徐华锋 陈婉娜 周农 吴宏伟 ZHANG Xiaoyue;XU Huafeng;CHEN Wanna;ZHOU Nong;WU Hongwei(School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China;Center for Fundamental Physics,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学力学与光电物理学院,淮南232001 [2]安徽理工大学基础物理研究中心,淮南232001

出　　处：《物理学报》2025年第5期87-96,共10页Acta Physica Sinica

基　　金：安徽省高校自然科学研究项目(批准号:2023AH051206,2022AH040114);安徽省高校协同创新项目(批准号:GXXT-2022-015)资助的课题.

摘　　要：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声音信息处理、传输和数据存储提供了新的机遇.本文结合声学波导和亚波长阿基米德螺旋结构设计了一种组合结构,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,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.这种由定向声源选择性激发声学斯格明子模式的方式为设计先进声学信息处理功能器件提供了新的途径.Acoustic skyrmion modes are topological texture structures of velocity field vectors generated on the surface of acoustic structures.This protected vector distribution provides new opportunities for processing sound information,transmission,and data storage.In this study,a combined structure of waveguides and spiral structures is designed by using directional acoustic sources to excite waveguide mode transmission,thereby achieving selective excitation of localized acoustic skyrmion modes.Through theoretical analysis and numerical simulations,the pressure field distribution and velocity field distribution excited by spin acoustic sources,Huygens acoustic sources,and Janus acoustic sources in this structure are investigated,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 propagating along the waveguide,the acoustic skyrmion modes in the helical structure in the direction corresponding to the propagation are selectively excited.When the Huygens source excites acoustic surface waves propagating along the waveguide,the acoustic skyrmion modes in the right or left direction are selectively excited.However,when the Janus source excites acoustic surface waves propagating along the waveguide,the acoustic skyrmion modes in the upward or downward direction are selectively excited.This selective excitation of acoustic skyrmion modes by a directional acoustic source provides a new way to design advanced acoustic information processing functional devices.

关 键 词：声学超构材料 声学斯格明子 声波定向传输 

分 类 号：TN9[电子电信—信息与通信工程]