Negative axial radiation forces on solid spheres and shells in a Bessel beam.
Prior computations predict that fluid spheres illuminated by an acoustic Bessel beam can be subjected to a radiation force directed opposite the direction of beam propagation. The prediction of negative acoustic radiation force is extended to the cases of a solid poly(methylmethacrylate) PMMA sphere in water and an empty aluminum spherical shell in water. Compared with the angular scattering patterns for plane wave illumination, the scattering into the back hemisphere is suppressed when the radiation force is negative. This investigation may be helpful in the development of acoustic tweezers and in the development of methods for manipulating objects during space flight.
Marston
Philip L
PL
Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA. marston@wsu.edu
D000162:Acoustics; D000535:Aluminum / Q000737:chemistry; D004548:Elasticity; D008956:Models, Chemical; D009038:Motion; D010316:Particle Size; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011312:Pressure; D012542:Scattering, Radiation; D014867:Water / Q000737:chemistry
D014867:Water; D019904:Polymethyl Methacrylate; D000535:Aluminum