title: The Use of Phononic Crystals to Design Piezoelectric Power Transducers.
abstract: It was recently proposed that the lateral resonances around the working resonance band of ultrasonic piezoelectric sandwich transducers can be stopped by a periodic array of circular holes drilled along the main propagation direction (a phononic crystal). In this work, the performance of different transducer designs made with this procedure is tested using laser vibrometry, electric impedance tests and finite element models (FEM). It is shown that in terms of mechanical vibration amplitude and acoustic efficiency, the best design for physiotherapy applications is when both, the piezoceramic and an aluminum capsule are phononic structures. The procedure described here can be applied to the design of power ultrasonic devices, physiotherapy transducers and other external medical power ultrasound applications where piston-like vibration in a narrow band is required.
authors.affiliation: ITEFI-CSIC, Serrano 144, 28006 Madrid, Spain. silvia.ronda@csic.es.
authors.forename: Silvia
authors.initials: S
authors.lastname: Ronda
authors.affiliation: Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Apartado Postal 1-1010, Querétaro 76230, Mexico. aragon@fata.unam.mx.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Aragón
authors.affiliation: ITEFI-CSIC, Serrano 144, 28006 Madrid, Spain. eiglesia.jml@gmail.com.
authors.forename: Elvira
authors.initials: E
authors.lastname: Iglesias
authors.affiliation: ITEFI-CSIC, Serrano 144, 28006 Madrid, Spain. francisco.montero@csic.es.
authors.forename: Francisco
authors.initials: F
authors.lastname: Montero de Espinosa
keywords: phononic crystals; physiotherapy; piezoelectric transducers