Reflection, Transmission, and Absorption of Vortex Beams Propagation in an Inhomogeneous Magnetized Plasma Slab

Li, Haiying; Honary, F.; Wu, Zhensen; Shang, Qingchao; Liu, Bai

doi:10.1109/tap.2018.2839753

Cited by 15 publications

(4 citation statements)

References 37 publications

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“…This is especially true for applications in which the characteristic resonant frequencies of a substance lie within these ranges. For example, the use of terahertz and microwave vortex beams for plasma diagnostics was discussed in [88][89][90]. Another promising application is communication systems [91,92].…”

Section: Discussionmentioning

confidence: 99%

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

et al. 2023

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The characteristics of high-power vortex Bessel beams in the terahertz range (λ=141 μm) obtained with the use of diffractive axicons (DAs) illuminated by a Gaussian beam of the Novosibirsk free-electron laser were studied. Two of the three possible types of DA recently described in our previous paper, namely, binary spiral silicon axicons (BAs), forming beams with a topological charge l equal to 0–4 and 9, and a diamond “holographic” axicon (HA), forming a beam with l=9, were used in the experiments. These axicons formed beams whose cross sections in the region of inner Bessel rings were close to those of ideal Bessel beams, but their intensities varied in azimuth with a frequency of l and 2l for the BAs and HA, respectively. However, in the case of the BAs, the beams had a pronounced helical structure at the periphery, whereas for the HA, the beam was axisymmetric. By focusing these beams with a lens, we studied the structure of the so-called “perfect” beams (PBs). While an ideal Bessel beam exhibits a PB as a thin ring, in the case of the BAs, we observed a broadened ring structure consisting of 2l short spirals, and for the HA, we observed a narrow ring with 2l maxima in azimuth. A comparison of the numerical calculations and experiments showed that the observed azimuthal intensity variations can be attributed to inaccuracies in the preparation of the axicon relief and/or discrepancies between the calculated and actual wavelengths, within a few percent. The results of this work enable the establishment of quality requirements for axicon manufacture and the appropriate selection of the axicon type in accordance with the requirements for the beam.

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Section: Discussionmentioning

confidence: 99%

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

et al. 2023

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“…One approach is to ignore the radial distribution of the field followed by sampling along the circle at a certain radius, see, e.g., [28,[50][51][52]]. An alternative approach, e.g., [27,[47][48][49] is to sample radial and angular distributions of the field on the whole measurement plane at the receiving end.…”

Section: Spiral Spectrum Expansion Methodsmentioning

confidence: 99%

“…They showed that the geometric properties of the sphere, e.g., the position, can be determined based on the scattering spiral spectrum data. Furthermore, the intensity distribution and OAM mode distortion of a Laguerre-Gaussian vortex beam reflected and transmitted by a non-uniform plasma plate were also examined by Li [27]. Later in 2020, Liu [28] used the physical optical algorithm to investigate the backscattering characteristics of an ideal conductive sphere and a PEC cone illuminated by a vortex beam.…”

Section: Introductionmentioning

confidence: 99%

Particle Scattering Induced Orbital Angular Momentum Spectrum Change of Vector Bessel–Gaussian Vortex Beam

et al. 2022

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In this paper, we obtain the intensity and phase distributions of the scattering and external fields of a vector Bessel–Gaussian vortex beam in the far-field region after being scattered by a particle. In our analysis, we use the Generalized Lorenz–Mie theory (GLMT) and the angular spectrum decomposition method (ASDM). The orbital angular momentum (OAM) spectra of the fields are analyzed by using the spiral spectrum expansion method, which is a frequently used tool for studying the propagation of vortex beams in turbulent atmospheres. Both scattered and external fields show a significant difference in spiral spectra for particles with different characteristic parameters, such as the size and complex refractive index. We also examine sampling the phase along with a circle and show that it is unable to fully express the information of the fields. This study can provide a theoretical basis for the inversion of characteristic parameters of the Bessel–Gaussian vortex beam and spherical particle by OAM spectra with applications in remote sensing engineering.

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“…e differences between the effects of three electron density profiles, with uniform, parabolic, and double exponential distributions, on the propagation properties were also compared. e angular spectrum expansion and the 4 × 4 transfer matrix method were applied by Li et al to investigate the reflection, transmission, and absorption of the vortex in an inhomogeneous and magnetized plasma slab [9]. e results proved that the parameters of the plasma have a significant impact on the magnitudes of the reflected and transmitted intensities and the distortion of orbital angular momentum states.…”

Section: Introductionmentioning

confidence: 99%

Study of the Propagation Characteristics of Terahertz Waves in a Collisional and Inhomogeneous Dusty Plasma with a Ceramic Substrate and Oblique Angle of Incidence

Rao

Wang

et al. 2021

International Journal of Antennas and Propagation

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In this paper, the propagation properties of a terahertz (THz) wave in a collisional and inhomogeneous dusty plasma with a ceramic substrate and oblique angle of incidence are studied using the scattering matrix method. The influence of the various corresponding parameters, such as the frequency of the THz wave, angle of incidence, electron density, radius and density of the dust particles, and the collision frequency, on the absorbance and transmittance is calculated. The results of the simulation indicate that an increase in the wave frequency increases the transmittance and decreases the absorbance. Moreover, the absorbance of a THz wave in a dusty plasma with a ceramic substrate increases with an increase in the incident angle, maximum electron density, coefficient of steepness, density and radius of the dust particles, and collision frequency. These results provide an important theoretical basis for the problem of communication blackout between ground and spacecraft.

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Reflection, Transmission, and Absorption of Vortex Beams Propagation in an Inhomogeneous Magnetized Plasma Slab

Cited by 15 publications

References 37 publications

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

Terahertz Bessel Beams Formed by Binary and Holographic Axicons

Particle Scattering Induced Orbital Angular Momentum Spectrum Change of Vector Bessel–Gaussian Vortex Beam

Study of the Propagation Characteristics of Terahertz Waves in a Collisional and Inhomogeneous Dusty Plasma with a Ceramic Substrate and Oblique Angle of Incidence

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