Topic
Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
Papers published on a yearly basis
Papers
More filters
29 Aug 2021
TL;DR: In this paper, a custom aspheric axicon lens for corneal water content sensing, operating from 220 to 330 GHz, was evaluated with spherical, dielectric shell targets.
Abstract: A custom aspheric axicon lens for corneal water content sensing, operating from 220 to 330 GHz, was evaluated with spherical, dielectric shell targets. The lens consisted of a hyperbolic back surface and conical front surface with a 25-degree axicon angle. An 8 mm radius of curvature, 1 mm thick, air backed dome was placed in the beam path and S 11 acquired at numerous axial offsets between dome and axicon. The data was normalized by equivalent radius of curvature metallic spherical reflectors. Fits to reflectivity data ranged from e = 4.1 and t = 0.89 mm and e = 4.16 and t = 0.885 for lens-tip to shell-apex distances of 34 mm and 25 mm respectively. The results suggest that Bessel beam illumination may relax axial alignment constraints in THz imaging of cornea.
1 citations
TL;DR: In this paper, the properties of Bessel beam propagation and transformation in optical metamaterials are studied by reflection and refraction of vectoral Bessel light beams (BLBs) containing embedded vortices on the boundary of a usual medium and metammaterial.
Abstract: The properties of Bessel beams propagation and transformation in optical metamaterials are studied. The problem is
solved by reflection and refraction of vectoral BLB containing embedded vortices on the boundary of a usual medium
and metamaterial. The reflection and refraction coefficients of arbitrary Bessel beam are represented as superposition of
linear combinations of reflection and refraction ones of TM- and TE- polarized Bessel beams. The possibility is established and conditions are determined for unidirectional and opposite directional propagation of Bessel light beams (BLBs) phase and the longitudinal component of its energy flux in metamaterials.
1 citations
TL;DR: In this article, the differential scattering characteristics of an object having a uniaxial anisotropic inclusion, for incidence of an arbitrarily shaped beam, are theoretically investigated, and the scattering problem is solved in a spherical basis by using the boundary conditions, method of moments technique and Schelkunoff's equivalence theorem, which leads to a system of linear equations for the expansion coefficients of the scattered and internal fields.
Abstract: The differential scattering characteristics of an object having a uniaxial anisotropic inclusion, for incidence of an arbitrarily shaped beam, are theoretically investigated. The scattering problem is solved in a spherical basis by using the boundary conditions, method of moments technique and Schelkunoff’s equivalence theorem, which leads to a system of linear equations for the expansion coefficients of the scattered and internal fields when the description of the incident shaped beam is known. The theoretical formulation is reviewed, and the numerical problems are discussed. As examples, for a Gaussian beam, zero-order Bessel beam and Hertzian electric dipole radiation striking a spheroid with a uniaxial anisotropic spheroid inclusion and a circular cylinder with a uniaxial anisotropic circular cylinder inclusion, the normalized differential scattering cross sections are calculated, and the scattering properties are analyzed concisely.
1 citations
30 Sep 2011
TL;DR: In this article, the authors show that a Bessel beam formed by axicon changes it is shape along the propagation axicon and become the beam corresponding to Bessel-Gaussian solution.
Abstract: Nowhere days, a Bessel beams are of a great interest because of their high importance in practical applications
in micromanipulations of micro particles and possibility to create a bottle-beams which employed in metal-cutting
machines.
Angular spectrum of a Bessel beam formed by a variety of a plane waves, belong to a hollow conical surface
with the angle 2β at the top of the cone. Take into account this fact, one can form a Bessel beam by means of the conical
lense-axicon. Generally speaking, we must note, that such a beam, formed by axicon changes it is shape along the
propagation axicon and become the beam corresponding to Bessel-Gaussian solution.
1 citations
TL;DR: In this article, a broader class of exchange symmetries in the scattering pattern in the (θ, β) domain are noted for vortex as well as zero-order beams.
Abstract: Bessel beams are characterized by a cone angle β and as previously noted there is an exchange symmetry in the scattering involving the cone and the scattering angle θ [Marston, J. Acoust. Soc. Am. 121, 753–758 (2007)]. The sphere is taken to be on the beam’s axis. In the present study a broader class of exchange symmetries in the scattering pattern in the (θ, β) domain are noted for vortex as well as zero-order beams. Reflection exchange symmetries are present in the scattering pattern about the lines: θ = β and (180 °−θ) = β. The radiation force is known to be affected by the angular asymmetry of the scattering pattern as a function of scattering angle [Zhang and Marston, Phys. Rev. E 84, 035601 (2011)]. It follows from angle exchange that the radiation force is similarly related to cone-angle asymmetry of the scattering pattern for a fixed scattering angle. This applies to negative as well as positive forces and is easily illustrated. [Work supported by ONR.]
1 citations