基于表面声波相位调制的拓扑斯格明子型微粒操控
Topological Skyrmion-type microparticle manipulation based on surface acoustic wave phase modulations
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中文总结 AI 辅助
该研究开发了基于三束表面声波相干干涉的声流控平台，利用拓扑声学斯格明子晶格实现微粒的稳定定位与可控旋转，拓展了表面声波操控的应用场景。
中文摘要 AI 辅助
表面声波（SAW）微操控可实现对微尺度粒子的精确非接触式处理，已在微流控与生物医学领域引起广泛关注。然而，传统SAW平台通常依赖简单的干涉场，这类场易受制造缺陷和环境扰动影响，导致捕获稳定性有限。本研究开发了一种基于SAW的声流控平台，通过三束SAW的相干干涉产生声学斯格明子晶格。这种拓扑结构化场提供了稳健的相位奇点与稳定的梯度力分布，可将微粒定位在预定义的晶格位点，并支持可控的旋转操控。对电输入的振幅和相位进行独立调制，可针对不同尺寸的粒子调节场强。数值模拟与概念验证实验证实了粒子在声学斯格明子场中的捕获与有序晶格组装，证明了将拓扑声学结构转化为实用片上操控功能的可行性。这种可重构策略为稳健的SAW操控提供了途径，或可应用于单细胞分析、三维细胞组装、高通量筛选及微纳器件组装等领域。
英文摘要
Surface acoustic wave (SAW) micromanipulation enables the precise, non-contact handling of microscale particles and has attracted considerable interest in microfluidics and biomedicine. However, conventional SAW platforms generally rely on simple interference fields which are susceptible to fabrication imperfections and environmental perturbations, resulting in limited trapping stability. Here, we develop a SAW-based acoustofluidic platform that generates an acoustic skyrmion lattice through the coherent interference of three SAWs. The topologically structured field provides robust phase singularities and a stable gradient-force landscape, enabling microparticles to be localized at predefined lattice sites and supporting controllable rotational manipulation. Independent modulation of the amplitude and phase of the electrical inputs allows the field strength to be tuned for particles of different sizes. Numerical simulations and proof-of-concept experiments confirm particle trapping and ordered lattice assembly in the acoustic skyrmion field, demonstrating the feasibility of translating topological acoustic textures into practical on-chip manipulation functions. This reconfigurable strategy offers a route to robust SAW manipulation and may support applications in single-cell analysis, three-dimensional cell assembly, high-throughput screening, and microscale and nanoscale device assembly.
