ZHANG Xiaoyue; XU Huafeng; CHEN Wanna; ZHOU Nong; WU Hongwei

doi:10.7498/aps.74.20241286

Abstract

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.

Keywords:

Authors and contacts

Corresponding author: XU Huafeng, xhfeng716@126.com ; WU Hongwei, hwwu@aust.edu.cn

Funds: Project supported by the Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (Grant Nos. 2023AH051206, 2022AH040114) and the University Synergy Innovation Program of Anhui Province, China (Grant No. GXXT-2022-015).

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Vol. 74, Issue 5 - 2025-03-05

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