Distortion of a twisted beam passing through a plasma layer

Nobahar, Davod; Akou, Hossein

doi:10.1364/ao.394698

Cited by 6 publications

(3 citation statements)

References 55 publications

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“…shows the weight distribution of the OAM states of the transmitted beams. Obviously, except the dominant OAM states ( 2, 2 in figure 9(a), 3, 1, 1, 3 -in figure 9(b)), some adjacent states are derived, and with the growth of N ,ep the weight of the dominant OAM state diminishes (which is in accord with the results in[38]). It means that the mutual OAM coupling and crosstalk are very significant.…”

supporting

confidence: 83%

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Tong

Ding

et al. 2022

Plasma Sci. Technol.

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The transmission of terahertz (THz) Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab is investigated by using a hybrid method of cylindrical vector wave functions (CVWFs) and Fourier transform. On the basis of the electromagnetic boundary conditions on each interface, a cascade form of expansion coefficients of the reflected and transmitted fields is obtained. Taking a double Gaussian distribution of the plasma density as an example, the influences of the applied magnetic field, the incident angle and polarization mode of the incident beams on the magnitude, OAM mode and polarization of the transmitted beams are analyzed in detail. The results indicate that the applied magnetic field has a major effect upon the polarization state of the transmitted fields but not upon the transmitted OAM spectrum. The incident angle has a powerful influence upon both the amplitude profile and the OAM spectrum of the transmitted beam. Furthermore, for multiple coaxial vortex beams, an increase of the maximum value of the plasma density causes more remarkable distortion of both the profile and OAM spectrum of the transmitted beam. This research makes a stable foundation for the THz OAM multiplexing/demultiplexing technology in magnetized plasma environment.

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supporting

confidence: 83%

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Tong

Ding

et al. 2022

Plasma Sci. Technol.

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“…Research has shown that when light waves are transmitted in a medium, their transmission characteristics are closely related to the medium's density and refractive index, and the anisotropy and asymmetry with spatial inhomogeneity have a significant impact on the amplitude and phase resulting in various phenomena and causing perturbations and distortions [13][14][15]. Nobahar and Akou explore the phase distribution of the vortex beam as it passes through a cold collision-less magnetized plasma layer [16]. Li et al investigated the phase distribution of a Laguerre-Gaussian beam after transport through free space and atmospheric turbulence [17].…”

Section: Introductionmentioning

confidence: 99%

Phase variation of Laguerre-Gaussian vortex beams in a homogeneous atmospheric medium under finite amplitude acoustic wave perturbation

Zhang,

Wang,

Wang

et al. 2023

Phys. Scr.

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In this article, we have derived the acoustic pressure and medium refractive index expressions in a homogeneous atmospheric medium perturbed by a planar finite amplitude acoustic wave. In a planar finite amplitude acoustic wave perturbation, we developed a Laguerre-Gaussian vortex beam transmission model in a homogeneous atmospheric medium. We investigated the effects of different acoustic source parameters on the phase of the Laguerre-Gaussian vortex beam transmission, considering the atmospheric medium's viscous effect. The results show that acoustic waves of finite amplitude distort the refractive index distribution of a homogeneous atmospheric medium. At a given distance, the amplitude of the refractive index gradually increases with increasing acoustic wave transmission distance. At the same time, the phase of the Laguerre-Gaussian vortex beam is rotated by the perturbation of the finite-amplitude acoustic wave, and the phase always returns to its initial position. Unlike linear acoustic waves, changes in the homogeneous atmospheric refractive index distribution and the homogeneous phase of the Laguerre-Gaussian vortex light no longer satisfy the periodic variation when perturbed by finite-amplitude acoustic waves. Under the same conditions, the effect of finite-amplitude acoustic waves on the phase of the Laguerre-Gaussian vortex light is stronger than that of linear acoustic waves. Finally, the effects of different acoustic pressure and frequency of the source on the phase of the Laguerre-Gaussian vortex beam transmission are calculated. The results show that different acoustic parameters at the source can be used to achieve phase modulation at different distances and intensities.

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“…Since the magnetized PFMM behaves as an anisotropic uniaxial medium, in this paper we utilize angular spectral expansion (ASE) technique accompanied by matrix method. This matrix formalism 39 is a powerful approach to solve the problems connected to the anisotropic multilayer media, and handily governs the intricacy of various modes of polarization coupling at the anisotropic layer interface 40 – 42 .…”

Section: Introductionmentioning

confidence: 99%

Vortex beam manipulation through a tunable plasma-ferrite metamaterial

Nobahar

Khorram

Rodrigues

2021

Sci Rep

Self Cite

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This paper is devoted to the study of vortex beam transmission from an adjustable magnetized plasma-ferrite structure with negative refraction index. We use the angular spectral expansion technique together with the $$4\times 4$$ 4 × 4 matrix method to find out the transmitted intensity and phase profiles of incoming Laguerre-Gaussian beam. Based on numerical analysis we demonstrate that high transparency and large amount of Faraday rotation in the proximity of resonance frequency region, reverse rotation of spiral wave front, and side-band modes generation during propagation are the remarkable features of our proposed structure. These controllable properties of plasma-ferrite metamaterials via external static magnetic field and other structure parameters provide novel facilities for manipulating intensity and phase profiles of vortex radiation in transmission through the material. It is expected that the results of this work will be beneficial to develop active magneto-optical devices, orbital angular momentum based applications, and wavefront engineering.

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Distortion of a twisted beam passing through a plasma layer

Cited by 6 publications

References 55 publications

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Transmission characteristics of terahertz Bessel vortex beams through a multi-layered anisotropic magnetized plasma slab

Phase variation of Laguerre-Gaussian vortex beams in a homogeneous atmospheric medium under finite amplitude acoustic wave perturbation

Vortex beam manipulation through a tunable plasma-ferrite metamaterial

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