Acoustic tweezers (ATs) have been extensively exploited in physics, biology, chemistry, and medical medicine. However, previous ATs are limited by complex designs and cumbersome configurations, and the stable manipulation of Mie particles remains challenging. Here, an AT based on acoustic focused petal beams (AFPBs) is proposed to realize 2D stable manipulations of both Rayleigh and Mie particles in water. The AFPBs are generated by artificial structure plates (ASPs) engraved with two kinds of discrete curved slits. It is found that the bright petals of AFPBs are flexibly modulated by arranging the sectors of curved slits on ASP, and the central zero-intensity region encircled by bright petals is increased with the number of petals. Then, the acoustic radiation forces of the AFPBs with 2 and 10 petals acting on the Rayleigh and Mie particles are further studied, respectively, and a force equilibrium position is found in both cases. Finally, two ASP samples are fabricated to experimentally verify the generations of AFPBs, and the 2D stable trappings and movements of both Rayleigh and Mie particles are realized by AFPBs. This miniaturized AT is beneficial to practical applications in material fabrication, drug delivery, and tissue engineering.

中文翻译：

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基于声聚焦花瓣束的瑞利和米氏粒子的声镊

声学镊子 (AT) 已广泛应用于物理学、生物学、化学和医学领域。然而，以前的 AT 受到复杂设计和繁琐配置的限制，并且 Mie 粒子的稳定操作仍然具有挑战性。在这里，提出了一种基于声聚焦花瓣束 (AFPB) 的 AT，以实现水中瑞利和米氏粒子的二维稳定操作。AFPB 由刻有两种离散弯曲狭缝的人工结构板 (ASP) 生成。发现通过在ASP上排列弯曲狭缝的扇区，AFPBs的亮瓣得到灵活调制，亮瓣包围的中心零强度区域随着瓣数的增加而增加。然后，进一步研究了具有 2 个和 10 个花瓣的 AFPB 分别作用于瑞利和米氏粒子的声辐射力，并在两种情况下都找到了力平衡位置。最后，制作了两个 ASP 样品以实验验证 AFPB 的生成，并且通过 AFPB 实现了瑞利和米氏粒子的二维稳定俘获和运动。这种小型化的 AT 有利于材料制造、药物输送和组织工程的实际应用。