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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.


Papers
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Proceedings ArticleDOI
01 Jan 2008
TL;DR: In this paper, a near-field enhancement at the surface of dielectric microspheres is used to generate nanometer scale features on a polyimide substrate, and the full width, half maximum of the features generated by this technique is measured and analyzed along with Finite Difference Time Domain simulations to predict the effects of bead size and pulsed laser energy.
Abstract: Laser direct-write patterning methods are traditionally limited by the diffraction limit to size scales several hundreds of nanometers at the minimum. In this work, we demonstrate a new method of laser based patterning that overcomes these limitations by taking advantage of near-field enhancement at the surface of dielectric microspheres. Polystyrene microspheres are trapped in CW Bessel beam laser traps above a polyimide surface. A second, pulsed ultraviolet laser gets focused through the bead, and produces nanometer scale features on the substrate. The full width, half maximum of the features generated by this technique is measured and analyzed along with Finite Difference Time Domain simulations to predict the effects of bead size and pulsed laser energy. It is demonstrated that using a 0.76 µm sphere to focus the processing laser results in spots with an average size of 130 nm and a standard deviation of 38 nm, showing that spots with sizes below the diffraction limit can be generated.Laser direct-write patterning methods are traditionally limited by the diffraction limit to size scales several hundreds of nanometers at the minimum. In this work, we demonstrate a new method of laser based patterning that overcomes these limitations by taking advantage of near-field enhancement at the surface of dielectric microspheres. Polystyrene microspheres are trapped in CW Bessel beam laser traps above a polyimide surface. A second, pulsed ultraviolet laser gets focused through the bead, and produces nanometer scale features on the substrate. The full width, half maximum of the features generated by this technique is measured and analyzed along with Finite Difference Time Domain simulations to predict the effects of bead size and pulsed laser energy. It is demonstrated that using a 0.76 µm sphere to focus the processing laser results in spots with an average size of 130 nm and a standard deviation of 38 nm, showing that spots with sizes below the diffraction limit can be generated.
Patent
25 Jan 2019
TL;DR: In this paper, an apparatus for generating a Bessel beam using a double feed source consisting of two identical feeds and a lens located on a plane is presented. But the beam splitting problem is solved in the traditional method, directly utilizing two beams for coherent modulation to obtain a bessel beam, the whole device is simple and practical, and the length thereof is shortened by 20% compared with the existing device.
Abstract: The invention discloses an apparatus for generating a Bessel beam using a double feed source. The apparatus comprises two identical feeds and a lens located on a plane. The geometrical centers of theexit surfaces of the two feeds are equal to the distance from the focal point of the lens, and the two feeds are dielectric rod antennas for incident the generated two Gaussian beams onto the lens foroutputting the Bessel beams. The device of the invention utilizes two identical feed sources, solves the problem of beam splitting in the traditional method, directly utilizes two beams for coherentmodulation to obtain a Bessel beam, the whole device is simple and practical, and the length thereof is shortened by 20% compared with the existing device.
Journal ArticleDOI
TL;DR: In this article , a birefringent dielectric metasurface is demonstrated, which is capable of generating Bessel beam whose polarization state continuously rotates along the propagation direction.
Abstract: The beam with longitudinally varied polarization provides a new dimension for polarization applications, such as material processing, longitudinal depth detection, optical communications, etc. A few different methods have so far been investigated, including spatial light modulators and diffractive optical elements. However, these methods have complex optical path, large volume, which are difficult to integrate. Here, a birefringent dielectric metasurface is demonstrated, which is capable of generating Bessel beam whose polarization state continuously rotates along the propagation direction. According to the design, when a linearly polarized light illuminates on the metasurface, the outgoing light becomes linearly polarized zero‐order Bessel beam, whose polarization angle changes as the propagation distance increases. Experimental measurements are successfully carried out. Such scheme may open new doors for potential applications in depth perception, microscopic detection, and so on.
Proceedings ArticleDOI
20 Jun 2022
TL;DR: In this article , the authors demonstrate the generation of Bessel beam from conically refracted laser diode radiation by using an annular distribution of the beam at the axicon.
Abstract: We demonstrate generation of Bessel beam from conically refracted laser diode radiation. Conical refraction provides annular distribution of the beam at the axicon that is favorable for efficient Bessel beam generation.
Proceedings ArticleDOI
08 Jul 2022
TL;DR: In this paper , a trench-assisted optical fiber is designed to generate Bessel beams with different shapes by using finite element method and electromagnetic field theory, which can improve the synchronous scanning rate.
Abstract: We have designed a trench-assisted optical fiber which can generate Bessel beams with different shapes by using finite element method and electromagnetic field theory. The trench-assisted structure is nested by rings with different refractive indexes. In the designed optical fiber, the HE11 mode fields are calculated with wavelengths ranging from 400 nm to 1500 nm. At the shorter wavelength, more energy is concentrated in the high refractive index ring region. When the wavelength increases from 400 nm to 2500 nm, the energy ratio in the high refractive index ring decreases from 98.1 % to 46.75 % , and the higher-order Bessel beam is converted to zero-order Bessel beam. Furthermore, the Bessel beams' shape can also be adjusted by tuning the structure parameters on the cross-section of the designed trench-assisted fiber. Eventually, a trench-assisted 16- core fiber is designed to generate multiple Bessel beams, which is beneficial to improve the synchronous scanning rate.

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