title: Calculation of acoustical radiation force on microsphere by spherically-focused source.
abstract: Based on the ray acoustics approach, the trapping effects on a microsphere by an ideally spherically-focused ultrasound are discussed. The acoustical radiation force from a focused ultrasound beam on a spherical particle in a three-dimensional sound field is calculated considering the effect of the attenuation of the ultrasound beam both inside the particle and in the surrounding medium. The results show that as long as the particle is in the range of the ultrasound beam and as long as the appropriate parameters of the transducer are selected, the particle will be captured in the vicinity of the focus of the ultrasound beam. Also, the particle radius and different parameters of the transducer are analyzed for their affect on the radiation force.
authors.affiliation: Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Wu
authors.affiliation: Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China; State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: xzliu@nju.edu.cn.
authors.forename: Xiaozhou
authors.initials: X
authors.lastname: Liu
authors.affiliation: Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
authors.forename: Jiehui
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
authors.forename: Xiufen
authors.initials: X
authors.lastname: Gong
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004867:Equipment Design; D008846:Micromanipulation / Q000295:instrumentation*; D008863:Microspheres; D008962:Models, Theoretical
keywords: Acoustical tweezers; Radiation force; Spherically-focused ultrasound; Three-dimensional trapping force