Manipulation of focal patterns in acoustic Soret type zone plate lens by using reference radius/phase effect

Daniel Tarrazó-Serrano; Constanza Rubio; Oleg V Minin; Pilar Candelas; Igor V Minin

doi:10.1016/j.ultras.2018.07.022

Manipulation of focal patterns in acoustic Soret type zone plate lens by using reference radius/phase effect

Ultrasonics. 2019 Jan:91:237-241. doi: 10.1016/j.ultras.2018.07.022. Epub 2018 Aug 4.

Authors

Daniel Tarrazó-Serrano¹, Constanza Rubio², Oleg V Minin³, Pilar Candelas¹, Igor V Minin⁴

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 State University, 30 Lenin Avenue, Tomsk 634050, Russia.
⁴ Tomsk State Politechnical University, 36 Lenin Avenue, Tomsk 634050, Russia.

PMID: 30126723
DOI: 10.1016/j.ultras.2018.07.022

Abstract

The manipulation of focal patterns of acoustic underwater Soret Zone Plate lens in far fields, such as manipulation (optimization) of Sidelobe Level and the design of long depth of focus by selecting the simple free parameter called reference radius (phase) has been demonstrated.Two effects have been studied by means of numerical simulations. Regarding the first effect, simulations demonstrate diffraction limited focal spot (0.47 wavelength) and 3 dB reduction of the first Side Lobe Level using Soret ZP with an optimal reference radius and without causing neither main lobe broadening or gain reduction. In the second effect, by using numerical simulations an increasing of depth of focus, more than 2 times, in comparison with classical Soret ZP with high numerical aperture (F/D = 2.5), was observed.

Keywords: Reference radius; Side lobel level; Soret Zone Plate; Ultrasonic lenses.