Ultrasonic focusing with mesoscale polymer cuboid

Daniel Tarrazó-Serrano; Constanza Rubio; Oleg V Minin; Antonio Uris; Igor V Minin

doi:10.1016/j.ultras.2020.106143

Ultrasonic focusing with mesoscale polymer cuboid

Ultrasonics. 2020 Aug:106:106143. doi: 10.1016/j.ultras.2020.106143. Epub 2020 Apr 1.

Authors

Daniel Tarrazó-Serrano¹, Constanza Rubio², Oleg V Minin³, Antonio Uris¹, Igor V Minin³

Affiliations

¹ Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
² Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain. Electronic address: crubiom@fis.upv.es.
³ Tomsk Polytechnic University, 36 Lenin Avenue, Tomsk 634050, Russia; Tomsk State University, 30 Lenin Avenue, Tomsk 634050, Russia.

PMID: 32259742
DOI: 10.1016/j.ultras.2020.106143

Abstract

In this paper, we demonstrate that, contrary to what the Geometrical Optics laws dictate, a flat polymer mesoscale cuboid immersed in water with no need of negative refraction can focus sound. Two main polymers were considered and lens parameters compared: PMMA and Rexolite®. It was concluded that Rexolite® is preferable for acoustic jet formation. The nature of the formation of the foci along the longitudinal axis, that is to say along the wave propagation axis, is numerically and experimentally demonstrated. In addition, the conditions under which a cubic particles lens of this type forms a single localized region with a sub-diffraction transverse size (approximately 0.44 wavelength) are determined. The comparisons of the acoustic wave pressures and the focal distance between the Finite Element Method based numerical results and the experimental results show fair agreement.

Keywords: Acoustic beam; Polymer mesoscale cuboid; Ultrasound.