Bessel beam

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

Pattern synthesis with UCA for the generation of Bessel-type beam at terahertz

Abstract: In the present paper we propose a new way to generate Bessel-type beams in the terahertz rang. According to the technique of pattern synthesis of antenna array, a uniform circular antenna array (UCA) is designed optimally to produce quasi-Bessel or Bessel-Gauss pattern. These beams possess a long depth of field and therefore have many important applications in the quasi-optic and/or terahertz fields. Numerical results demonstrate that the proposed method can be employed to readily produce zero-order quasi-Bessel or Bessel-Gauss beams.

Non-diffractive laser resonators

Abstract: Summary form only given. Proposes a simple route to the realisation of a Bessel-beam laser based on an optical resonator formed by a conical mirror and a plane mirror. The fascination of Bessel beams (BBs) lies in the fact that, under ideal conditions, they propagate indefinitely without spreading or any other change of shape. Although the distance over which a real Bessel beam can propagate without significant alteration is limited by the aperture of the optical system, a number of practical applications nevertheless exist. For instance, higher-order Bessel beams comprise tubes of light, and the latter have been proposed as potential atom guides in atom-optics experiments. Having laser resonators that produce BBs would be a great convenience.

Micro-optical system for depth-controlled Bessel beam arrays

Abstract: We present an integrated, compact micro-optical system capable to generate depth-controlled Bessel beams by integrating a miniaturized adaptive liquid crystal ring aperture array with a micro-lens array, a lensacon, which is a combination of a lens and an axicon. We were able to successfully demonstrate a functional system that is able to generate and control Bessel beams.

Metamaterial-based bessel beam launcher

Abstract: A coaxially fed device that generates Bessel beams over a broad bandwidth is presented. The concept of quasi-conformal transformation optics is employed to engineer an inhomogeneous, isotropic dielectric region that bends the waves emitted by an electrically small monopole into a paraxial Bessel beam. The axicon angle remains relatively constant over a large frequency range. As a result, non-diffracting, highly localized pulses (X waves) can be emitted under a pulse excitation. The design methodology and the metamaterial implementation of the launcher are discussed. The device is currently being fabricated.

Modification of Aberration Nondiffraction Beams in Manufacture Error of Elliptical Axicon

Abstract: Beam′s oblique incidence and manufacture error of an axicon have a great influence on the quality of zero-order Bessel beams.Generally,the manufacture error is that the cross section of the axicon is not a circle but an ellipse.Based on the diffraction and geometry optics,the quality equivalence between the beam′s oblique incidence in a circular axicon and beams incidence in vertical angle in an elliptical axicon are analyzed.The diffractive optical patterns in oblique illumination on a circular axicon and the manufacture error in an elliptical axicon were simulated according to the calculation.The method to modify the influence on the nondiffraction Bessel beam of an elliptical axicon by rotating the axicon is proposed and the approximately perfect Bessel beams are obtained.The experimental result agrees with the theoretical analysis and numerical simulation.