Experimental verification of circular motion of Mie particles trapped within focused acoustic vortex beams

doi:10.1088/1674-1056/ade857

Abstract Techniques for manipulating nanodroplets lie at the core of numerous miniaturized systems in chemical and biological research endeavors. In this study, we introduce a versatile methodology for calculating the acoustic vortex field, integrating hybrid wave equation principles with ray acoustics. This approach demonstrates remarkable consistency between simulated results and experimental observations. Importantly, both theoretical analysis and experimental validation confirm that particles whose diameters match the wavelength (Mie particles) can be effectively trapped within a focused acoustic vortex field, rotating in circular trajectories centered at the vortex center. This research significantly expands the scope of acoustic vortex manipulation for larger particles and introduces a novel implementation strategy with potential applications in targeted drug delivery for clinical adjuvant therapy.

Keywords: focused acoustic vortex ray acoustic topological charge circular trajectories Mie particles

Received: 03 May 2025
Revised: 16 June 2025
Accepted manuscript online: 26 June 2025

PACS:	43.72.+q	(Speech processing and communication systems)
	43.38.Hz	(Transducer arrays, acoustic interaction effects in arrays)

Fund: Project supported by the National Key R&D Program of China (Grant No. 2023YFE0201900).

Corresponding Authors: Qingdong Wang
E-mail: wangqingdong@sdust.edu.cn

Cite this article:

Zhengbao Li(李正宝), Hongyu Li(李洪宇), and Qingdong Wang(王青东) Experimental verification of circular motion of Mie particles trapped within focused acoustic vortex beams 2025 Chin. Phys. B 34 094303

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Experimental verification of circular motion of Mie particles trapped within focused acoustic vortex beams

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