title: Two-dimensional analytic modeling of acoustic diffraction for ultrasonic beam steering by phased array transducers.
abstract: Phased array ultrasonic transducers enable modulating the focal position of the acoustic waves, and this capability is utilized in many applications, such as medical imaging and non-destructive testing. This type of transducers also provides a mechanism to generate tilted wavefronts in acousto-optic deflectors to deflect laser beams for high precision advanced laser material processing. In this paper, a theoretical model is presented for the diffraction of ultrasonic waves emitted by several phased array transducers into an acousto-optic medium such as TeO2crystal. A simple analytic expression is obtained for the distribution of the ultrasonic displacement field in the crystal. The model prediction is found to be in good agreement with the results of a numerical model that is based on a non-paraxial multi-Gaussian beam (NMGB) model.
authors.affiliation: CREOL, The College of Optics & Photonics, University of Central Florida, 4304 Scorpius Street, Orlando, FL 32816-2700, USA.
authors.forename: Tiansi
authors.initials: T
authors.lastname: Wang
authors.affiliation: Intel - Assembly & Test Technology Development, 5000 W Chandler Blvd, Chandler, AZ 85226, USA.
authors.forename: Chong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Intel - Components Research, 5000 W Chandler Blvd, Chandler, AZ 85226, USA.
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Aleksov
authors.affiliation: Intel - Assembly & Test Technology Development, 5000 W Chandler Blvd, Chandler, AZ 85226, USA.
authors.forename: Islam
authors.initials: I
authors.lastname: Salama
authors.affiliation: CREOL, The College of Optics & Photonics, University of Central Florida, 4304 Scorpius Street, Orlando, FL 32816-2700, USA; Mechanical and Aeronautical Engineering and Material Science Engineering Department, University of Central Florida, P.O. Box 162700, Orlando, FL 32816-2700, USA. Electronic address: akar@creol.ucf.edu.
authors.forename: Aravinda
authors.initials: A
authors.lastname: Kar
keywords: Acousto-optic; Phased array transducer; Photo-acoustics; Ultrasonic beam steering