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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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09 May 2022
TL;DR: In this paper , the authors focused on electromagnetic scattering of PEC objects by collimated Bessel beams, especially for upcoming imaging applications, and on design criteria for innovative Bessel beam launchers at microwaves and millimeter waves.
Abstract: This work is focused on electromagnetic scattering of PEC objects by collimated Bessel beams, especially for upcoming imaging applications, and on design criteria for innovative Bessel beam launchers at microwaves and millimeter waves. Numerical examples are obtained by exploiting the developed analytical model for scattering, and finally an example of Bessel beam launcher obtained by an equivalent surface impedance on a planar aperture (i.e., building block for metasurface synthesis) is shown.
TL;DR: In this paper , the authors investigate the transverse trapping force acting on a small particle on or off the central axis of zero-order finite Bessel beams and show that dense and stiff particles can be trapped at the maximum central pressure in the main lobe and also the maximum pressure of the other transverse locations.
Abstract: We investigate the transverse trapping force acting on a small particle on or off the central axis of zero-order finite Bessel beams. Combining the simulated fields with the Gorkov force potential, the transverse trapping behaviors for small objects are analyzed, and the reversal of the trapping behaviors is recovered when varying the paraxiality parameter of the Bessel beam. The results prove the possibility of using axisymmetric Bessel beams to trap both dense and stiff particles as well as light and soft ones. The particles can be trapped at the maximum central pressure in the main lobe and also the maximum pressure of the other transverse locations. A lossy acoustic metastructure with the ability to decouple the phase and amplitude modulations is used to generate the desired sound field, which is used to trap a foam ball as an example. Our research opens a promising avenue to the design and development of simplified acoustic tweezers.
TL;DR: In this paper, the authors present a setup to generate tightly focused Bessel beams that is composed of a half-ball lens coupled with a relay lens, which is simple and compact compared to conventional imaging of axicons based on microscope objectives.
Abstract: We present a setup to generate tightly focused Bessel beams that is composed of a half-ball lens coupled with a relay lens. The system is simple and compact compared to conventional imaging of axicons based on microscope objectives. We experimentally demonstrate the generation of a Bessel beam with a 42° cone angle at 980 nm in air with a typical beam length of 500µm and a central core radius of about 550 nm. We numerically studied the effects of the misalignment of the different optical elements and the range of tilt and shift that are acceptable to obtain a regular Bessel beam.
TL;DR: In this article , the scattering phenomenon caused by Bessel beam irradiation on metal particles is studied based on Generalized Lorenz-Mie Theory (GLMT), and the effect of the size of metal particles on the total intensity distribution of the light field around metal particles are investigated using the software simulation calculation.
Abstract: Based on Generalized Lorenz-Mie Theory (GLMT), the scattering phenomenon caused by Bessel beam irradiation on metal particles is studied. The order and polarization mode of Bessel beam, as well as the influence of the size of metal particles on the total intensity distribution of the light field around metal particles are investigated by using the software simulation calculation. The results show that for spherical metal particles of the same size, the higher order Bessel beam is more likely to bypass the metal particles in the forward propagation, while the lower order Bessel beam bypassed the particles in the propagation is related to the beam polarization mode. The results have potential applications in microscopy super-resolution imaging and detection of tiny particles.
26 Mar 2023
TL;DR: In this article , the authors considered the case where an axially aligned metallic obstacle is placed between the two launchers to validate the self-healing property of Bessel beams and defined a limit for the radius' scatterer up to which the generated Bessel beam is valid.
Abstract: The generation and propagation of Bessel beams between two apertures with obstructed line-of-sight at microwave frequencies is studied herein. Both the transmitting and receiving apertures are based on leaky radial waveguides consisting of an array of metallic patches over a grounded dielectric substrate. The present work focuses in the case where an axially aligned metallic obstacle is placed between the two launchers to validate the self-healing feature of Bessel beams. Obstacles with different radius are considered and their effect in the power efficiency studied. A limit for the radius’ scatterer is defined up to which the self-healing property of the generated Bessel beam is valid.