Tailoring of abrupt autofocusing vortex beams using a phase mask
Journal
Applied Optics
Series/Report No.
Applied Optics
Journal Volume
63
Journal Issue
28
Start Page
G87
End Page
G96
ISSN
1559-128X
2155-3165
Date Issued
2024-10-01
Author(s)
Vyas S.
DOI
10.1364/AO.527601
Abstract
Vortex beams, characterized by their helical phase fronts and orbital angular momentum, have generated significant interest due to their unique properties. Combining these beams with abrupt autofocusing (AAF) characteristics, which exhibit self-healing and shape transformation during propagation, offers promising potential for various applications. In this study, we propose a method to generate AAF vortex beams using a phase-only mask. Our approach involves a cubic chirp-modulated axicon phase superimposed with a spiral phase distribution. Through numerical simulations, we investigate the formation and propagation dynamics of these beams, exploring the influence of mask parameters on beam characteristics. The pseudo-Bessel beam produced at the focal plane by the AAF vortex beam generates a higher-order Bessel beam characterized by helical phase fronts. Our results demonstrate the generation of AAF vortex beams with well-defined fractional charges and composite vortex structures. These findings contribute to a deeper understanding of AAF vortex beam behavior and lay the groundwork for their practical implementation in diverse fields.
Publisher
Optica Publishing Group
Type
journal article