关键词: focused acoustic vortex, ray acoustic, topological charge, circular trajectories, Mie particles

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.

Key words: focused acoustic vortex, ray acoustic, topological charge, circular trajectories, Mie particles