Dual-ring focused acoustic vortices with adjustable intensity and interval via hybrid-degenerated cribriform plates
Phys. Rev. Applied 23, 064033 – Published 12 June, 2025
DOI: https://doi.org/10.1103/trtp-b6cm
Abstract
Dual-ring acoustic vortices carrying two orbital angular momentums are anticipated to provide new perspectives and capabilities for acoustic communication and microparticle manipulation. However, the flexible generation of a high-quality dual-ring acoustic vortex is still a challenge. Here, a hybrid-degenerated cribriform plate (HDCP) is proposed to produce a dual-ring focused acoustic vortex (FAV). The HDCP comprises L sets of circular holes arranged on L counterclockwise Fresnel spiral (FS) arms. A part of these circular holes is concurrently located on M clockwise FS-arms. Their distribution regularities on the counterclockwise and clockwise FS-arms have been analytically derived to effectively tailor the dual-ring FAVs: an outer FAV with topological charge L and an inner FAV with topological charge −M. Furthermore, an HDCP stainless steel structure is fabricated to experimentally demonstrate the generation of a dual-ring FAV. Finally, the combined action of the outer and inner FAVs is demonstrated to be able to roll a particle along an annular trajectory. The dual-ring FAVs generated by the proposed concept of HDCPs may find potential applications in particle manipulation and acoustic communication.
