Generation of a sub-diffracted Bessel beam via diffraction interference in a combined amplitude structure | Zendy

Wencong Wang | Zendy; Dongmei Liu | Zendy; Miṅ Gu | Zendy; Peng Han | Zendy; Min Xiao | Zendy

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Generation 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 - 2020

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.

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