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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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01 Dec 2010
TL;DR: The generated Bessel beam from all-fiber structure composed of single mode fiber, coreless silica fiber, and micro-lens formed on the fiber facet showed a good performance for optical trapping confirming its non-diffracting and self-reconstructing nature as mentioned in this paper.
Abstract: The generated Bessel beam from all-fiber structure composed of single mode fiber, coreless silica fiber, and micro-lens formed on the fiber facet showed a good performance for optical trapping confirming its non-diffracting and self-reconstructing nature
Proceedings ArticleDOI
01 Jun 2016
TL;DR: In this article, the authors present the design and experimental validation of a novel Bessel-beam launcher suitable for millimeter-wave applications, which is achieved by exciting a higher-order TM leaky mode in a grounded dielectric slab loaded with a capacitive impedance sheet.
Abstract: In this work, we present the design and the experimental validation of a novel Bessel-beam launcher suitable for millimeter-wave applications A zeroth-order Bessel beam is generated for the vertical component of the electric field This is achieved by exciting a higher-order TM leaky mode in a grounded dielectric slab loaded with a capacitive impedance sheet The distinctive feature of the proposed device is the use of a higher-order leaky mode: this allows scaling of the device to higher frequencies than would be possible using previous designs based on the fundamental leaky mode As a result, thinning of the dielectric layer is avoided and ohmic losses are reduced Simple design rules are provided for these types of devices Measurements of a final prototype together with full-wave simulations validate the Bessel-beam generation in the desired mm-wave range
Proceedings ArticleDOI
22 Jun 2003
TL;DR: In this article, the amplitude of gradient forces acting on a transparent spherical particle in the field of the zeroth order Bessel beam is calculated, taking into account heterogeneity of acting radiation in the volume of particle.
Abstract: Summary form only given. The dielectric particles in electromagnetic field are affected by force of light pressure, which are usually divided into gradient forces and scattering forces. Micromanipulation of particles and their spatial separation are possible, using of these forces (spatial separation require the localization of particle and then its transportation to another spatial region). It is more optimally to use the Bessel beams for the spatial separation of particles. The Bessel beams are characterized by smaller divergence then the Gaussian ones with equal power and width. Their application may increase the distance of transportation more than an order. In this paper the amplitude of gradient force acting on a transparent spherical particle in the field of the zeroth order Bessel beam is calculated. The obtained expression for gradient force amplitude, takes into account heterogeneity of acting radiation in the volume of particle. Optimal conditions (parameters of particle, liquid, and Bessel beam) for localization and transportation of a particle are determined using the solution of kinetic-equation. It was shown, that for some definite relationships between the particle size and the width of Bessel beam the localization region is shifted from the central maximum of the beam. It is cause by the equilibrium the gradient forces from the central maximum and from first interference ring of the Bessel beam. The qualitative comparison of the obtained results with known experimental data is performed.
Proceedings ArticleDOI
01 Dec 2015
TL;DR: In this paper, a reflectarray is proposed to transform a quasi-Gaussian beam into Gaussian beam and a Gaussianbeam is transformed into zero-order Bessel beam.
Abstract: In millimeter wave and THz band, the wave always propagates in the form of beams, such as Gaussian beam, Bessel beam. The generation, control, and transform of these beams are very important. This paper proposed a reflectarray to transform these beams at millimeter wave length. By properly design the reflect phase shift at each position on the reflectarray, a quasi-Gaussian beam is transformed into Gaussian beam and a Gaussian beam is transformed into zero-order Bessel beam. The simulated results show that the beam transformation efficiency of the reflectarray is approaching the transparent transformation technology.
Posted Content
TL;DR: In this paper, the authors developed a Bessel ultrasonic transducer for large depth of field by using conical acoustic lens, which is a cuboid prism with a concave cone on the bottom, made of fused silica.
Abstract: Ultrasonic transducer is a sensor that realizes the mutual conversion of ultrasonic and electrical signals, and it is widely used in quality inspection, biomedical imaging and other fields. Commonly used ultrasonic transducers have a small detection range and low sensitivity due to the diffraction of sound waves. Focused transducers are used to improve detection sensitivity. Unfortunately, focused transducers have narrow depth of field. Here, we developed a Bessel ultrasonic transducer for large depth of field by using conical acoustic lens. An acoustic lens is attached to a unfocused ultrasonic. And the acoustic lens is a cuboid prism with a concave cone on the bottom, made of fused silica. Similar to an axicon that can generate a Bessel beam, the Bessel ultrasonic transducer can produce nondiffracting Bessel ultrasonic beams. Therefore, extended depth of field with uniformly high resolution and high detection sensitivity can be obtained. We used COMSOL to simulate the transmission of ultrasonic field of the designed conical acoustic lens, and compare it with the spherical focused ultrasonic transducer. The results show that the depth of field of the Bessel ultrasonic transducer is about 8 times that of the conventional spherical focused ultrasonic transducer. And the depth of field of the Bessel ultrasonic transducer can be further adjusted by adjusting the cone angle of the conical acoustic lens. The Bessel ultrasonic transducer will help improve the capabilities of the ultrasound probe and expand its application range. For example, an ultrasonic probe with a large depth of field will expand the imaging depth of photoacoustic microscopy and enhance its ability in non-destructive testing.

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