Three-Dimensional Trapping and Manipulation of a Mie Particle by Hybrid Acoustic Focused Petal Beams

Yan-Chun Luo, Xin-Rui Li, Da-Jian Wu, Jie Yao, Xing-Feng Zhu, Liang-Fen Du, and Xiao-Jun Liu

Phys. Rev. Applied 17, 064059 – Published 29 June 2022

Abstract

Acoustic manipulations of microparticles have significant implications in physics, chemistry, biology, and biomedicine. For large Mie particles, both the scattering force and the gradient force affect the trapping and manipulation behaviors, and thus, a passive acoustic tweezer (AT) for three-dimensionally manipulating a Mie particle remains challenging. Here, a passive AT based on a hybrid acoustic artificial plate is proposed to generate a hybrid acoustic focused petal beam (HAFPB) for capturing and manipulating a Mie microparticle in three dimensions. In the HAFPB, a lateral acoustic focused petal beam and an axial bifocal acoustic beam (BAB) combine to create a central zero-intensity zone for particle trapping, which can be adjusted by modulating the topological charge of the HAFPB. The acoustic radiation forces (ARFs) acting on large Mie particles with different diameters are investigated. The ARFs on the polystyrene sphere are greatly influenced by the particle size. If the particle is larger than the central zero-intensity zone, an AT with a larger topological charge and a stronger BAB is required for trapping and manipulating this larger particle. Finally, the experiments demonstrate that the AT can stably trap and manipulate a large Mie particle in three dimensions in water.

Received 6 April 2022
Revised 22 May 2022
Accepted 24 May 2022

DOI:https://doi.org/10.1103/PhysRevApplied.17.064059

Physics Subject Headings (PhySH)

Acoustic interactions Acoustic wave phenomena Beam optics Microparticles Mie scattering Ultrasonics

Acoustic techniques Optical tweezers

General PhysicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Yan-Chun Luo ¹, Xin-Rui Li¹, Da-Jian Wu ^1,†, Jie Yao^1,2, Xing-Feng Zhu^1,2, Liang-Fen Du³, and Xiao-Jun Liu ^2,*

¹Jiangsu Key Lab on Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
²MOE Key Laboratory of Modern Acoustics, School of Physics, Nanjing University, Nanjing 210093, China
³School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore

^*liuxiaojun@nju.edu.cn
^†wudajian@njnu.edu.cn

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Issue

Vol. 17, Iss. 6 — June 2022

Subject Areas

Acoustics

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Images

Figure 1
(a) Schematic diagram of the combined FSSs for producing a lateral AFPB. (b) Schematic diagram of the BFZP for generating an axial BAB. (c) Schematic diagram of the HAAP for realizing the AT.
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Figure 2
(a1) Schematic diagram of a HAAP for a smaller AT with l = 2. (a2) Three-dimensional view of the normalized acoustic intensity distribution of the smaller AT. Normalized acoustic (a3) intensity and (a4) phase distributions of the smaller AT in three focal planes of z = 12λ, 8λ, and 4λ. (b1) Schematic diagram of a HAAP for a larger AT with l = 5. (b2) Three-dimensional view of the normalized acoustic intensity distribution of the larger AT. Normalized acoustic (b3) intensity and (b4) phase distributions of the larger AT in three focal planes of z = 12λ, 8λ, and 4λ.
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Figure 3
(a) Normalized simulated acoustic intensity distributions of the smaller AT with l = 2 in the x-z plane and on three focal planes of z = 12λ, z = 8λ, and z = 4λ. (b) Normalized simulated acoustic intensity distributions of the larger AT with l = 5 in the x-z plane and on three focal planes of z = 12λ, z = 8λ, and z = 4λ. (c) Simulated Gor’kov potentials of the smaller AT in the x-z plane and on three focal planes of z = 12λ, z = 8λ, and z = 4λ. (d) Simulated Gor’kov potentials of the larger AT in the x-z plane and on three focal planes of z = 12λ, z = 8λ, and z = 4λ. Arrows indicate the negative spatial gradient of the Gor’kov potential.
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Figure 4
Normalized simulated acoustic intensity distribution of the larger AT with l = 5 in the x-z plane, where a PS sphere with a diameter of (a1) 0.6 mm (0.4λ), (b1) 0.75 mm (0.5λ), (c1) 1.5 mm (1.0λ), and (d1) 2.5 mm (1.67λ) is placed at the center. F_z exerted on the PS sphere with a diameter of (a2) 0.6 mm (0.4λ), (b2) 0.75 mm (0.5λ), (c2) 1.5 mm (1.0λ), and (d2) 2.5 mm (1.67λ) by the larger AT. F_x exerted on the PS sphere with a diameter of (a3) 0.6 mm (0.4λ), (b3) 0.75 mm (0.5λ), (c3) 1.5 mm (1.0λ), and (d3) 2.5 mm (1.67λ) by the larger AT.
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Figure 5
(a) Photographs of the modified steel HAAP sample for the larger AT with l = 5. (b) Simulated three-dimensional acoustic intensity distribution of the modified HAAP and the corresponding acoustic intensity distribution in three focal planes of z = 12λ, 8λ, and 4λ. (c) Photograph of the Mie PS particle suspended in water, which will move along a circular path in the x-y plane. Pictures of the Mie PS particle at (d) beginning and (e) end positions of the three-dimensional spiral motion.
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Physical Review Applied