Open AccessTransverse circular-polarized Bessel beam generation by inward cylindrical aperture distribution
Author(s) -
Santi C. Pavone,
Mauro Ettorre,
Massimiliano Casaletti,
Matteo Albani
Publication year - 2016
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.24.011103
Subject(s) - optics , bessel function , transverse plane , polarization (electrochemistry) , physics , aperture (computer memory) , bessel beam , electric field , beam (structure) , diffraction , angular aperture , spiral (railway) , circular polarization , focal length , acoustics , lens (geology) , mathematics , chemistry , structural engineering , quantum mechanics , engineering , microstrip , mathematical analysis
In this paper the focusing capability of a radiating aperture implementing an inward cylindrical traveling wave tangential electric field distribution directed along a fixed polarization unit vector is investigated. In particular, it is shown that such an aperture distribution generates a non-diffractive Bessel beam whose transverse component (with respect to the normal of the radiating aperture) of the electric field takes the form of a zero-th order Bessel function. As a practical implementation of the theoretical analysis, a circular-polarized Bessel beam launcher, made by a radial parallel plate waveguide loaded with several slot pairs, arranged on a spiral pattern, is designed and optimized. The proposed launcher performance agrees with the theoretical model and exhibits an excellent polarization purity.