title: Designing single-beam multitrapping acoustical tweezers.
abstract: The concept of a single-beam acoustical tweezer device which can simultaneously trap microparticles at different points is proposed and demonstrated through computational simulations. The device employs an ultrasound beam produced by a circular focused transducer operating at 1 MHz in water medium. The ultrasound beam exerts a radiation force that may tweeze suspended microparticles in the medium. Simulations show that the acoustical tweezer can simultaneously trap microparticles in the pre-focal zone along the beam axis, i.e. between the transducer surface and its geometric focus. As acoustical tweezers are fast becoming a key instrument in microparticle handling, the development of acoustic multitrapping concept may turn into a useful tool in engineering these devices.
authors.affiliation: Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil. Electronic address: glauber@pq.cnpq.br.
authors.forename: Glauber T
authors.initials: GT
authors.lastname: Silva
authors.affiliation: Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil.
authors.forename: André L
authors.initials: AL
authors.lastname: Baggio
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D008846:Micromanipulation; D008863:Microspheres; D013016:Sound
keywords: Acoustic radiation force; Acoustical tweezer; Ultrasound focused beam