Propagation Properties of Terahertz Waves in a Time-Varying Dusty Plasma Slab Using FDTD

Wang, Maoyan; Yu, Miao; Xu, Zhihua; Li, Guiping; Bao-jun, Jiang; Xu, Jun

doi:10.1109/tps.2015.2493001

Cited by 50 publications

(24 citation statements)

References 24 publications

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“…From Figures 3 and 5, it is noted that the self-focusing and absorption phenomena of high-power laser beams in plasma are evident as compared with those propagating in free space as illustrated in Figures 1 and 2. The physical model of permittivity with ponderomotive nonlinearity given by Equation (8) determines that the refractive index of plasma is smaller at the place where the light intensity is lower and larger where the light intensity is stronger. The ensuing inhomogeneous distribution of refractive-index attribute to the self-focusing effect and the laser beam is therefore focused when this effect overly counteracts the natural diffractive divergence of the laser beam.…”

Section: Discussionmentioning

confidence: 99%

“…The main research areas have focused on the propagation characteristics of high-power laser beams in plasma [4][5][6]. The Drude model of electrical conduction is extensively considered in this research field [7,8]. Sharma et al [9] have found that the propagation characteristics of an intense laser beam in plasma depend on the power and width of the beam and the ratio of plasma frequency and light wave frequency.…”

Section: Introductionmentioning

confidence: 99%

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Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

et al. 2018

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The propagation characteristics of high-power laser beams in plasma is an important research topic and has many potential applications in fields such as laser machining, laser-driven accelerators and laser-driven inertial confined fusion. The dynamic evolution of high-power Laguerre-Gaussian (LG) beams in plasma is numerically investigated by using the finite-difference time-domain (FDTD) method based on the nonlinear Drude model, with both plasma frequency and collision frequency modulated by the light intensity of laser beam. The numerical algorithms and implementation techniques of FDTD method are presented for numerically simulating the nonlinear permittivity model of plasma and generating the LG beams with predefined parameters. The simulation results show that the plasma has different field modulation effects on the two exemplified LG beams with different cross-sectional patterns. The self-focusing and stochastic absorption phenomena of high-power laser beam in plasma are also demonstrated. This research also provides a new means for the field modulation of laser beams by plasma.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

et al. 2018

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“…Dependences of the refractive ( ) and absorption ( ) indices in a dusty plasma on the ratio / for various concentrations of dust particles. The calculation parameters are = 1 × 10 −6 m, = 1 × 10 19 m −3 , = 1 × 10 19 m −3 , = 10 eV and = 0.1 a number of works [24,[40][41][42][43][44][45][46][47][48][49][50][51]. In so doing, a number of simplifications and assumptions in Eqs.…”

Section: Refractive and Absorption Indicesmentioning

confidence: 99%

“…In so doing, a number of simplifications and assumptions in Eqs. (43)- (46) are often made [24,[33][34][35][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Refractive and Absorption Indicesmentioning

confidence: 99%

Specific Features of Microwave Methods for Dusty Plasma Diagnostics. I. Dielectric Permittivity, Refractive and Absorption Indices

Kovtun

Skibenko

et al. 2019

Ukr. J. Phys.

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Two widely used approaches for the determination of the refractive, n, and absorption, ϰ, indices of a dusty plasma have been analyzed. In one of them, the expressions for n and ϰ obtained for a dust-free plasma are used, but the collisions of plasma ions with dust particles are taken into account by means of the collision frequency parameter. In the other approach, the characteristic charging frequency for dust particles is additionally introduced.

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“…[5][6][7][8] These methods can be grossly divided into two categories: based on manipulating the distribution or physical characteristics of the plasma sheath, such as aerodynamic shaping, 6 magnetic windows, 7 and electrophile injection, 8 the E × B field interaction 9 and the transient strong magnetic pulse, 10 and based on changing radio propagation models, such as three-wave scattering theory 11,12 and increasing the radio frequency to the Ka band even the terahertz. 13 These methods can reduce the attenuation caused by the plasma sheath and ensure that the radio waves can effectively penetrate the plasma sheath. However, when boundary layer becomes turbulent (plasma sheath becomes time-varying), plasma effects on the electromagnetic wave propagation are much more complex.…”

Section: Introductionmentioning

confidence: 99%

Propagation of phase modulation signals in time-varying plasma

Yang

Wang

et al. 2016

AIP Advances

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The effects of time-varying plasma to the propagation of phase modulation signals are investigated in this paper. Through theoretical analysis, the mechanism of the interaction between the time-varying plasma and the phase modulation signal is given. A time-varying plasma generator which could produce arbitrary time-varying plasma is built by adjusting the discharge power. A comparison of results from experiment and simulation prove that the time-varying plasma could cause the special rotation of QPSK (Quadrature Phase Shift Keying) constellation, and the mechanism of constellation point’s rotation is analyzed. Additionally, the experimental results of the QPSK signals’ EVM (Error Vector Magnitude) after time-varying and time-invariant plasma with different ωp/ω are given. This research could be used to improve the TT&C (Tracking Telemeter and Command) system of re-entry vehicles.

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Propagation Properties of Terahertz Waves in a Time-Varying Dusty Plasma Slab Using FDTD

Cited by 50 publications

References 24 publications

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

Propagation Characteristics of High-Power Vortex Laguerre-Gaussian Laser Beams in Plasma

Specific Features of Microwave Methods for Dusty Plasma Diagnostics. I. Dielectric Permittivity, Refractive and Absorption Indices

Propagation of phase modulation signals in time-varying plasma

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