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Bessel beam

About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.


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Proceedings ArticleDOI
15 Oct 2005
TL;DR: In this article, the authors developed a scheme for non-destructive optical profilometry of cylindrically shaped surfaces by using spatially matched conical light beams. But this scheme requires the use of a Bessel beam over a wide range.
Abstract: We present our results of the development of some schemes for nondestructive optical profilometry of cylindrically shaped surfaces by using spatially matched conical light beams. A theoretical model is elaborated which describes profilometers with Bessel beams. A special feature of the profilometers proposed is the possibility to control their sensitivity and resolution. To this end, a scheme of tuning the cone angle of the Bessel beam over a wide range is incorporated. The operation regime of the profilometers is characterized by a nonzero spatial frequency of output signal. It allow us to apply a new algorithm for the interpretation of the output signal. This algorithm consists in the calculation of the azimuth spectrum which characterizes the deviation of tested profiles from the circular ones.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigate the ability of an asymmetric Bessel beam to recover their original intensity profile when it is perturbed by an obstruction, and additionally drastically perturb by a pattern of light generated by an annular obstruction.
Abstract: Recent studies have shown that an asymmetric Bessel beam, similar to a conventional non-diverging Bessel beam; recovers their original intensity profile after encountering an obstruction. Here, we investigate the ability of an asymmetric Bessel beam to recover their original intensity profile when it is perturbed by an obstruction, and additionally drastically perturbed by a pattern of light generated by an annular obstruction. We believe that their intriguing properties have not been fully studied. A better understanding of their properties can help to make use of them appropriately in a variety of potential applications. Our investigations reveal that the dynamics of the reconstruction is affected by the asymmetry degree of the beam.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the amplitude-phase distributions of the field in real perfect beams were calculated numerically in the approximation of the scalar diffraction theory, and a distribution closest to an ideal vortex was obtained using a holographic axicon.
Abstract: Transformation of a Bessel beam by a lens results in the formation of a “perfect” vortex beam (PVB) in the focal plane of the lens. The PVB has a single-ring cross-section and carries an orbital angular momentum (OAM) equal to the OAM of the “parent” beam. PVBs have numerous applications based on the assumption of their ideal ring-type structure. For instance, we proposed using terahertz PVBs to excite vortex surface plasmon polaritons propagating along cylindrical conductors and the creation of plasmon multiplex communication lines in the future (Comput. Opt. 2019, 43, 992). Recently, we demonstrated the formation of PVBs in the terahertz range using a Bessel beam produced using a spiral binary silicon axicon (Phys. Rev. A 2017, 96, 023846). It was shown that, in that case, the PVB was not annular, but was split into nested spiral segments, which was obviously a consequence of the method of Bessel beam generation. The search for methods of producing perfect beams with characteristics approaching theoretically possible ones is a topical task. Since for the terahertz range, there are no devices like spatial modulators of light in the visible range, the main method for controlling the mode composition of beams is the use of diffractive optical elements. In this work, we investigated the characteristics of perfect beams, the parent beams being quasi-Bessel beams created by three types of diffractive phase axicons made of high-resistivity silicon: binary, kinoform, and “holographic”. The amplitude-phase distributions of the field in real perfect beams were calculated numerically in the approximation of the scalar diffraction theory. An analytical expression was obtained for the case of the binary axicon. It was shown that a distribution closest to an ideal vortex was obtained using a holographic axicon. The resulting distributions were compared with experimental and theoretical distributions of the evanescent field of a plasmon near the gold–zinc sulfide–air surface at different thicknesses of the dielectric layer, and recommendations for experiments were given.

7 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated vector Bessel beams in bianisotropic media for an arbitrary value of transverse wavenumber and found the impedance tensors, characteristic matrices, reflection and transmission operators of a multi-layer system.
Abstract: Vector Bessel beams in bianisotropic media are investigated for an arbitrary value of transverse wavenumber. We find the impedance tensors, characteristic matrices, reflection and transmission operators of a multi-layer system. In a layered periodic structure with a bianisotropic elementary cell, beam radial modulation and substantial decrease of the reflected Bessel beam diameter are obtained.

7 citations

Proceedings ArticleDOI
01 Dec 2019
TL;DR: In this article, a 3D printed discrete dielectric lens operating at 0.3 THz was proposed to transform the quasi-Gaussian beam from a commercially available feed horn into a well collimated and confined pseudo-Bessel beam.
Abstract: This paper introduces a nondiffraction Bessel beam launcher based on 3-dimensional (3-D) printed discrete dielectric lens operating at 0.3 THz. The designed thin dielectric lens can transform the quasi-Gaussian beam from a commercially available feed horn into a well collimated and confined pseudo-Bessel beam. Moreover, an in-housed developed 3-D printing technology is used to manufacture the designed terahertz lens aiming at simplifying the manufacturing process with low cost. Measured and simulated results demonstrate that the proposed lens can generate nondiffraction Bessel beam with a constant spot size and constant axial intensity over a considerable range at terahertz frequencies.

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202373
2022149
2021113
2020126
2019134
2018140