Parametric Study of the Subwavelength Ultrasound Beam Generated by Core-Shell Lens

Abstract

Subwavelength Focused Beams (SFB) generated by Ball-Shaped lens has attracted attention of researchers due its simplicity and efficacy to overcome the diffraction limit and produce high resolution images. However, the main features of the SFB (width, length and intensity) are related with the mechanical properties of the lens and surround medium, as well as the size of the lens core and shell. To establish a detailed analysis of the SFB generated by core-shell lenses, in this work we present a parametric study of the size and mechanical properties of the lenses. To perform the numerical studies, we used the Finite Element Method (FEM) through the commercial software COMSOL Multiphysics. Our results shown that, the beams features using a Rexolite shell and fluids cores are more sensible compared with metallic cores. This result shows that they have greater versatility in terms of high-resolution applications.