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

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Qingwen Rao ◽  
Guanjun Xu ◽  
Pengfei Wang ◽  
Zhengqi Zheng
Keyword(s):  
Electron Density ◽  
Dusty Plasma ◽  
Collision Frequency ◽  
Incident Angle ◽  
Ceramic Substrate ◽  
Dust Particles ◽  
Angle Of Incidence ◽  
Oblique Angle ◽  
Terahertz Waves ◽  
Thz Wave

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.

The Interaction of Terahertz Waves and a Dusty Plasma Slab with Epstein Distribution

Frequenz ◽  
2016 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Maoyan Wang ◽  
Zhitao Xu ◽  
Yuliang Dong ◽  
Jun Xu ◽  
Meng Zhang
Keyword(s):  
Electron Density ◽  
Dusty Plasma ◽  
Electromagnetic Scattering ◽  
Fdtd Method ◽  
Characteristic Parameter ◽  
Dusty Plasmas ◽  
Plasma Sheath ◽  
Dust Particles ◽  
Terahertz Waves ◽  
Plasma Slab

AbstractThe Auxiliary Differential Equation Finite Difference Time Domain (ADE-FDTD) method is applied to study the electromagnetic scattering of a dusty plasma sheath with Epstein distribution. The charging response factor of dust particles and angular plasma frequency of the dusty plasma are functions of space-varying electron density with an Epstein profile. The verification of the numerical ADE-FDTD algorithm for the dusty plasma is given. The propagation properties of Terahertz (THz) waves through a dusty plasma slab affected by the characteristic parameter and modulation factor of the Epstein distribution are discussed. The absorption coefficients of the slab influenced by the electron density, density of dust particles, and effective collision frequency are studied. It is shown that Terahertz waves may be an efficient tool for high density dusty plasmas detection and diagnostics.

Drift dissipative instability in a dusty plasma: Do dust particles reduce intensity of density irregularities in the lower ionosphere?

2015 ◽  
Vol 93 (4) ◽  
pp. 466-468
Author(s):  
Shobha Surve ◽  
V.H. Kulkarni
Keyword(s):  
Electron Density ◽  
Dusty Plasma ◽  
Dust Particle ◽  
Growth Rates ◽  
Lower Ionosphere ◽  
Dust Particles ◽  
Drift Waves ◽  
E Region ◽  
Dissipative Instability

We re-analyzed the effect of loss of electrons and hence the reduction in electron density on drift dissipative instability. We find that the growth rates of the drift waves decrease. The analysis suggests that the presence of dust particle, if they are responsible for the loss of background electrons, will reduce the intensity of density irregularities in the E region of the ionosphere.

scholarly journals Study on the Propagation Characteristics of Terahertz Waves in Dusty Plasma with a Ceramic Substrate by the Scattering Matrix Method

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 263
Author(s):  
Qingwen Rao ◽  
Guanjun Xu ◽  
Pengfei Wang ◽  
Zhengqi Zheng
Keyword(s):  
Dusty Plasma ◽  
Dust Particle ◽  
Matrix Method ◽  
Collision Frequency ◽  
Scattering Matrix ◽  
Ceramic Substrate ◽  
Propagation Characteristics ◽  
Propagation Properties ◽  
Scattering Matrix Method ◽  
Thz Waves

The propagation characteristics of terahertz (THz) waves incident vertically into inhomogeneous and collisional dusty plasma with a ceramic substrate are studied using the scattering matrix method (SMM). The effects of the incident wave frequency and plasma parameters, such as the maximal electron density, dust particle density, dust particle radius and collision frequency, on the reflectance and transmittance of THz waves in the dusty plasma are discussed. In addition, the differences of the propagation properties in the dusty plasma, with and without ceramic substrate, are analyzed. Meanwhile, the differences of the propagation properties in dusty plasma and common plasma, respectively, with ceramic substrate are also compared. Simulation results show that the substrate and dust particles have significant influence on the propagation characteristics of THz wave in plasma sheath. Finally, the transmission increases with the increase of electron density, dust density, dust particle radius and collision frequency.

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

2019 ◽  
Vol 64 (5) ◽  
pp. 380
Author(s):  
Yu. V. Kovtun ◽  
A. I. Skibenko ◽  
E. I. Skibenko ◽  
Ye. V. Siusko
Keyword(s):  
Dielectric Permittivity ◽  
Dusty Plasma ◽  
Plasma Diagnostics ◽  
Collision Frequency ◽  
Frequency Parameter ◽  
The Other ◽  
Dust Particles ◽  
Plasma Ions ◽  
Free Plasma

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.

Future lunar missions and investigation of dusty plasma processes on the Moon

2013 ◽  
Vol 79 (4) ◽  
pp. 405-411 ◽  
Author(s):  
SERGEY I. POPEL ◽  
LEV M. ZELENYI
Keyword(s):  
Dusty Plasma ◽  
Lunar Surface ◽  
Dust Particles ◽  
Maximum Height ◽  
Charged Dust ◽  
The Moon ◽  
Plasma System ◽  
Lunar Dust ◽  
The Impact ◽  
Dusty Plasma System

AbstractFrom the Apollo era of exploration, it was discovered that sunlight was scattered at the terminators giving rise to “horizon glow” and “streamers” above the lunar surface. Subsequent investigations have shown that the sunlight was most likely scattered by electrostatically charged dust grains originating from the surface. A renaissance is being observed currently in investigations of the Moon. The Luna-Glob and Luna-Resource missions (the latter jointly with India) are being prepared in Russia. Some of these missions will include investigations of lunar dust. Here we discuss the future experimental investigations of lunar dust within the missions of Luna-Glob and Luna-Resource. We consider the dusty plasma system over the lunar surface and determine the maximum height of dust rise. We describe mechanisms of formation of the dusty plasma system over the Moon and its main properties, determine distributions of electrons and dust over the lunar surface, and show a possibility of rising dust particles over the surface of the illuminated part of the Moon in the entire range of lunar latitudes. Finally, we discuss the effect of condensation of micrometeoriod substance during the expansion of the impact plume and show that this effect is important from the viewpoint of explanation of dust particle rise to high altitudes in addition to the dusty plasma effects.

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

2015 ◽  
Vol 43 (12) ◽  
pp. 4182-4186 ◽  
Author(s):  
Maoyan Wang ◽  
Mengxia Yu ◽  
Zhitao Xu ◽  
Guiping Li ◽  
Baojun Jiang ◽  
...  
Keyword(s):  
Dusty Plasma ◽  
Time Varying ◽  
Terahertz Waves ◽  
Plasma Slab ◽  
Propagation Properties

scholarly journals Propagation Characteristics of Oblique Incident Terahertz Wave in Nonuniform Dusty Plasma

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Yunhua Cao ◽  
Haiying Li ◽  
Zhe Wang ◽  
Zhensen Wu
Keyword(s):  
Dusty Plasma ◽  
Terahertz Wave ◽  
Dust Particles ◽  
Number Density ◽  
Propagation Characteristics ◽  
Absorption Coefficients ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Propagation Matrix ◽  
Transmission And Absorption

Propagation characteristics of oblique incident terahertz wave from the nonuniform dusty plasma are studied using the propagation matrix method. Assuming that the electron density distribution of dusty plasma is parabolic model, variations of power reflection, transmission, and absorption coefficients with frequencies of the incident wave are calculated as the wave illuminates the nonuniform dusty plasma from different angles. The effects of incident angles, number density, and radius of the dust particles on propagation characteristics are discussed in detail. Numerical results show that the number density and radius of the dust particles have very little influences on reflection and transmission coefficients and have obvious effects on absorption coefficients. The terahertz wave has good penetrability in dusty plasma.

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