The Study Of Acoustic Radiation Forces On The Cylindrical Particle Induced By Airy Beam

In modern life,the technology of non-contact control and capture of nano-size particles is needed in many field,especially in medicine and industry.Acoustical tweezers has attracted widely attention due to the radiation forces induced by sound waves on the micro-particles in its sound field.Scholars have studied the characteristics of acoustic radiation forces induced by commonly used sound waves deeply,such as plane progressive wave,Bessel wave and focused wave,etc.,airy beam is newly introduced from the optics,in this paper,we study the acoustic radiation forces induced by airy beams on cylindrical particles due to its special properties.In the first chapter,we briefly introduce the definition,research methods and development history of acoustic radiation force,and then introduce the recent researches of airy beams in tweezers and the main contents of this paper.The second chapter introduces the two airy-gaussian beams into the acoustic radiation force on cylindrical particles,we deduce the expression of incident velocity potential in details,calculate the scattering coefficients according to the boundary conditions of the particle,obtain the expression of acoustic radiation forces.We study the radiation forces in different phase differences and beam widths in the two airy-gaussian beams,discuss the effect of micro particle size radius on acoustic radiation forces,emphatically analyze the influence of phase difference on the particle motion state in the process of micro-particle movement.The results show that the phase difference between the two airy-gaussian beams is important for the control of the motion of the particles.In the third chapter we discuss the acoustic radiation forces on a pair of the micro-particles,this chapter gives the velocity potential expression of a single airy beam,we derive out all velocity potential in the field according to the interaction between the two particles,and obtain scattering coefficients and acoustic radiation forces formula according to the boundary conditions of two particles.We study the acoustic radiation forces under the angle change of incident airy beam,discuss the influence of particle space and particle size ratio on acoustic radiation force.The results show that we can obtain the expected radiation forces when the parameters of particle are selected appropriately.In the fourth chapter we use a pair of airy beams instead of a single airy beam acting on the pair of particles,according to the second and third chapter we can deduce the incident velocity potential of two airy beams and all other velocity potentials in the sound fields,then obtain the scattering coefficients and the acoustic radiation force expressions using the boundary conditions of two particles.In this chapter,the influences of phase difference,the beams space and the incident angle of beams on the acoustic radiation forces are analyzed,and the acoustic radiation forces changing with the two particles sizes are discussed.The results further confirmed the conclusions in chapter 2 and 3.In the fifth chapter,we make a summary and prospect of the full paper.