Abstract
Previously, zeroth order Bessel-like beams have been generated by axisymmetric diffraction gratings. Here, we report the generation of high order Bessel beams by the diffraction of plane waves over spiral shaped scatters. The acoustical beam vortex structure is analyzed and a method for generate arbitrary order Bessel beams based in multiple arms spirals is presented. A passive device is experimentally tested in the ultrasound regime and a first order Bessel vortex beam is observed. Simulations in the weak nonlinear regime are also included where the conservation law for the ratio between the topological charge of the beam and the generated harmonic order is proved. This novel technique can be used to generate cheap lenses for acoustic particle manipulation and acoustic radiation force applications.
BibTeX citation
@other{phdc6,
author = {Noé Jiménez},
pages = {153-191},
title = {Chapter 6 - Chiral Beams generated by Spiral Gratings},
year = {2015}
}