Helical particle manipulation based on power-exponent-phase acoustic vortices generated by a sector transducer array

• Published in: Chinese physics B Vol. 32; no. 6; pp. 64304 - 385
• Main Authors: Wang, Qingdong, Hu, Yantao, Wang, Shengli, Li, Hongyu
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.05.2023; College of Ocean Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China%Department of Modern Architecture,Linyi Vocational College,Linyi 276017,China
• Subjects: acoustic vortices; particle manipulation; power-exponent-phase; sector transducer array; spiral potential well; particle manipulation; power-exponent-phase; acoustic vortices; sector transducer array; spiral potential well
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/acc800

The characteristics of traditional acoustic vortices (AVs) were verified by the cross-sectional axisymmetric pressure distributions with perfect phase spirals around the center pressure null. In order to generate a non-axisymmetric pressure distribution, the concept of power-exponent-phase was first introduced into the formation of AV beams, named “power-exponent-phase acoustic vortices (PAVs)” in this paper. Based on a ring-array of sector transducers, the helical distribution of the low-pressure valley in cross-sections of PAVs, which enables particles to move from a distant position to the center low-potential well along a certain spiral passageway, was proved theoretically. The particle manipulation behavior for PAVs with a power order of 2 is numerically modeled and experimentally confirmed. The results show that PAVs with a non-axisymmetric spiral pressure distribution can be used to realize the directional transport of particles in an enlarged scope, suggesting prospective application potential in biomedical engineering.