An engineered acoustic lens for a narrow acoustic jet generation

Abstract

Herein, we numerically investigate novel engineered shell structures immersed in water to generate narrow acoustic jets (AJs). In our simulations, acrylonitrile butadiene styrene and polylactic acid, two kinds of 3D printing materials, are selected for designing acoustic lenses. The engineered cylindrical shell with a cross or a hole is presented to generate a narrow AJ. Our simulation shows that the FWHM of the AJ can reach below λ/3. We also show that the engineered schemes are effective for the spherical lens and a rotational symmetric AJ with an FWHM of ∼0.4λ is achieved.