Topic
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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TL;DR: A broadband acoustic metagrating is demonstrated which can concentrate the diffraction effects of phase gratings in the first (±1) orders and achieve multifunctional wave steering such as broadband anomalous diffraction.
Abstract: Metasurface has recently attracted a lot of attentions for controlling wave fields. Based on the diffraction effects of phase gratings, we demonstrate a broadband acoustic metagrating which can concentrate the diffracted waves in the first (±1) orders and achieve multifunctional wave steering such as broadband anomalous diffraction. In the acoustic metagrating, the subwavelength rectangular waveguides (SRWs) function as the periodic elements to replace the fences in ordinary gratings. Thus, we can achieve a group of phase delay from 0 to 2π independently with frequency just by reconfiguring the relative locations of the effective apertures. With the iterative algorithm, the acoustic metagrating can be used to record the phase profile and then control the output waveform. We further demonstrate that the broadband metagrating can be used to achieve the acoustic Gaussian beam. By rotating the periodic elements into a two-dimensional structure, the Bessel beam is further obtained.
14 citations
TL;DR: In this paper, a pure phase diffractive optical element is proposed for efficient generation of elliptic perfect optical vortices (EPOVs), which also have diameters independent on the topological charge.
14 citations
TL;DR: Mechanical and structural conditions for the emergence of negative axial forces based on the elastodynamic response of acoustically penetrable objects and beam's nonparaxiality parameter are provided to lead to the development of predictable and robust single-beam acoustic handling devices.
Abstract: The mechanism of generating backward dragging forces on objects standing in the path of a single, translationally invariant, symmetric acoustic Bessel beam is studied. This paper aims to provide mechanical and structural conditions for the emergence of negative axial forces based on the elastodynamic response of acoustically penetrable objects and beam's nonparaxiality parameter. An extensive numerical study has been performed for various liquid and solid elastic cases to illustrate the validity of the proposed eigenfrequency-based conditions. Results have revealed the existence of a complex but interpretable link between the emergence of negative radiation forces on spheres illuminated by zero-order Bessel beams and the eigenfrequencies of the particle. Considerable progress has been made in elucidating these relationships, which may lead to the development of predictable and robust single-beam acoustic handling devices.
14 citations
TL;DR: In this article, the authors studied the anti-Stokes emission of stimulated Raman scattering (SRS) in hydrogen gas pumped with a Bessel beam of variable cone angle.
14 citations
ARCO1
TL;DR: In this paper, an analytical expression for the intensity pattern associated with a field propagating from a circular aperture with a truncated J 0 Bessel beam distribution was obtained. And the diffraction integral in the scalar diffraction theory was evaluated in both the far field and the near field and numerical results were presented for the irradiance pattern on the beam axis as well as in the transverse plane.
14 citations