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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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TL;DR: In this article , the authors established a theoretical model of the intensity distribution and peak energy density of the Bessel-like beams based on a simplified phase of arc axicon, which contributed to the longer ablation length and higher ablation precision in the silica glass.
TL;DR: In this paper, the authors present an interesting property of broadband coherent radiation emitted by a single microbunch, or a single-cycle density modulation in an electron beam passing through an undulator, and describe its application to a frequency upconversion of the singlecycle modulation.
Abstract: We present an interesting property of broadband coherent radiation emitted by a single microbunch, or a single-cycle density modulation in an electron beam passing through an undulator, and describe its application to a frequency upconversion of the single-cycle modulation. This is based on the fact that a monocycle pulse is generated by focusing the coherent radiation with a unit-magnification optical system, which propagates without diffraction like the Bessel beam, at a reduced group velocity equal to the average electron velocity in the undulator. Calculations show that a single microbunch with a length of 46-nm formed in a 2-GeV and 2-kA electron beam can be upconverted to a 4-nm long microbunch through interaction with focused coherent radiation.
22 May 2005
TL;DR: In this article, the existence of dispersion-free and diffraction-free ultra-short vectorial pulsed Bessel beams is predicted in one-dimensional photonic bandgaps (PBGs) using a Wannier function technique.
Abstract: Existence of dispersion-free and diffraction-free ultra-short vectorial pulsed Bessel beams is predicted in one-dimensional photonic bandgaps (PBGs) using a Wannier-function technique. Pulsed Bessel beam propagation in a GaAs layered PBG is in particular considered.
01 Mar 2019
TL;DR: In this article, a transmissive periodic metasurface based on double-layer metal wire structure is designed by combining gradient phase theory with Pancharatnam-Berry (P-B) phase theory to control scattering phase of electromagnetic wave.
Abstract: In this paper, a transmissive periodic metasurface based on double-layer metal wire structure is designed by combining gradient phase theory with Pancharatnam-Berry (P-B) phase theory to control scattering phase of electromagnetic wave. The proposed artificial electromagnetic medium lens can improve the cross-polarized wave conversion efficiency of the phase discontinuous metasurface and ensure the thickness of the lens is ultrathin relative to the working wavelength.
07 Mar 2022
TL;DR: In this article , the authors compared two imaging systems for accurate measurements of the morphological structure and volume quantification of 3D tumor spheroids, OCT using a scan lens and EDOF-OCM which uses a Bessel beam to expand the depth of field.
Abstract: 3D cell models indicate stronger similarities in vivo than monolayer cell culture, and thus is raising awareness as an important tool for evaluating biological phenomena, drug action, and mechanism of diseases. This paper compared two imaging systems for accurate measurements of the morphological structure and volume quantification of 3D tumor spheroids. The two imaging systems are OCT using a scan lens and EDOF-OCM, which uses a Bessel beam to expand the depth of field. Human hepatoma cells were used for spheroid formation. To compare the effectiveness of the imaging system, we measured the spheroid structure according to cell number per spheroid and growth per day. Although both systems were able to acquire the morphological structure and quantify volume of 3D tumor spheroids the OCM using the Bessel beam was able to more accurately measure the overall structure of the spheroid without surface reflection.