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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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Patent
02 Dec 2004
TL;DR: In this article, an instrument and a method of high precision and high sensitivity for measuring X-ray diffraction having 1 μm order of spatial resolution has been proposed, where a concentric circular FZP pattern portion is provided on a Ta film on an SiN film by an electron beam drawing technique or the like to form a Fresnel zone plate (FZP).
Abstract: PROBLEM TO BE SOLVED: To provide an instrument and a method of high precision and high sensitivity for measuring X-ray diffraction having 01 μm order of spatial resolution SOLUTION: A concentric circular FZP pattern portion 101 is provided on a Ta film on an SiN film by an electron beam drawing technique or the like to form a Fresnel zone plate (FZP) 100 X-ray non-transmission processing by gold plating is executed in the central portion 102 and a peripheral portion of the FZP 100 to irradiate a sample 106 with only light condensed while avoiding an influence of direct light An incident X-ray beam 104 is made to get incident into the FZP 100, and a Bessel beam 107 formed in a transmission beam is emitted onto a measuring objective area of the sample 106 The unnecessary diffraction X-ray included in the diffraction X-ray beam is removed by a pinhole 109, and only diffraction light 108 from the irradiation area of the Bessel beam on the sample 106 is made to get incident into a detector 110, so as to measure intensity thereof COPYRIGHT: (C)2005,JPO&NCIPI

1 citations

Proceedings ArticleDOI
30 Sep 2005
TL;DR: In this article, the authors studied the coherent interaction between a highly localized discrete soliton and a non-diffracting beam in a one-dimensional AlGaAs array at a wavelength of 1550 nm and confirmed that the wide beam is able to drag the soliton over multiple waveguides towards itself.
Abstract: Discrete nonlinear optical systems exhibit unique properties unknown from wave propagation in bulk materials. Among them are the possibilities to form highly localized discrete solitons and the ability of a wide beam to propagate without diffraction and modulational instability across the array. The interaction between a highly localized discrete soliton and a non-diffracting beam has potential applications for all optical routing and switching. We present our results on the experimental investigation of this kind of beam interactions in a one-dimensional AlGaAs array at a wavelength of 1550 nm. A discrete soliton, almost completely confined to a single waveguide, was excited and the interaction with a wide beam of the same or orthogonal polarization was studied. We confirmed that the wide beam is able to drag the soliton over multiple waveguides towards itself while the soliton is able to maintain its original, highly confined shape. The outcome of the coherent interaction depends on the power of the wide beam and the relative phase between the two beams. This phase-dependence is due to linear interference in the case of co-polarized beams and due to four-wave mixing for orthogonally polarized beams.

1 citations

Proceedings ArticleDOI
01 Dec 2018
TL;DR: Based on the generalized multi-particle Mie equation (GMM) and Electromagnetic Momentum (EM) theory, the lateral binding force (BF) exerted on stratified biological cells induced by an arbitrary polarized high-order Bessel beam (HOBB) is investigated with particular emphasis on the half-conical angle of the wave number components as mentioned in this paper.
Abstract: Based on the generalized multi-particle Mie equation (GMM) and Electromagnetic Momentum (EM) theory, the lateral binding force (BF) exerted on stratified biological cells induced by an arbitrary polarized high-order Bessel beam (HOBB) is investigated with particular emphasis on the half-conical angle of the wave number components. The illuminating HOBB with arbitrary polarization angle is described in terms of beam shape coefficients (BSCs) within the framework of generalized Lorenz-Mie theories (GLMT). Different types of cells, including a real Chinese Hamster Ovary (CHO) cell and a lymphocyte which are respectively modeled by a coated and five-layered sphere, are studied. Numerical effects of various parameters such as beam polarization angles, incident wavelengths, particle sizes are numerically analyzed in detail. The observed dependence of the separation of optically bound particles on the incidence of HOBB is in agreement with earlier theoretical prediction. Accurate investigation of BF induced by HOBB could provide an effective test for further research on BF between more complex particles, which plays an important role in using optical manipulation on particle self-assembly.

1 citations

Proceedings ArticleDOI
17 May 2019
TL;DR: In this article, an arbitrary order Bessel beam with arbitrary incidence is generated numerically in FDTD method using a total-field/scattered-field (TF/SF) approach.
Abstract: An arbitrary order Bessel beam with arbitrary incidence is generated numerically in finite-difference time-domain (FDTD) method using a total-field/scattered-field (TF/SF) approach. This is implemented by decomposition of Bessel beam into a series of plane waves, which are projected into the FDTD simulation domain. The off-axis incidence case is realized by tuning the arrival time when the elementary plane wave gets to the center area of simulation domain, and the oblique incidence case is implemented by rotating the plane waves through Euler angles. Numerical examples concerning backscattering radar cross-sections (RCS) are presented to demonstrate the validity, accuracy, and capability of the proposed method. The results in this paper provide an efficient way to investigate the interactions of Bessel beams and particles with complex shape and composition using FDTD.

1 citations


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