Open AccessGeneration of a sub-diffracted Bessel beam via diffraction interference in a combined amplitude structure
Author(s) -
Wencong Wang,
Dongmei Liu,
Miṅ Gu,
Peng Han,
Min Xiao
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.410360
Subject(s) - optics , bessel beam , diffraction , bessel function , beam (structure) , interference (communication) , physics , diffraction grating , amplitude , laser beam quality , grating , optical vortex , spiral (railway) , materials science , laser , laser beams , telecommunications , channel (broadcasting) , mathematical analysis , mathematics , computer science
We have theoretically investigated the use of a simple combined amplitude structure to produce a sub-diffracted Bessel beam via diffraction interference. This powerful structure is composed of a spiral slit and radial grating. When a vortex beam illuminates this combined amplitude structure, a subwavelength Bessel beam with a size of 0.39λ and a long working distance of approximately 100 µm is numerically realized. By tailoring the parameters of the spiral slit, we can obtain a longer sub-diffracted Bessel beam. Moreover, the observed Bessel beam has low-energy side-lobes. The peculiar features of our theoretically generated Bessel beam have numerous potential applications, such as in nanoparticles manipulation, super-resolution imaging, and lithography.