Wave propagation in and around negative-dielectric-constant discharge plasma

Sakai, Osamu; Iwai, Akinori; Omura, Yoshiharu; Iio, Satoshi; Naito, Takashi

doi:10.1063/1.5009413

Cited by 17 publications

(11 citation statements)

References 38 publications

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“…This became an interesting property for present material composites. It was a well-known fact that the negative dielectric constant will be observed due to the plasmonic oscillations of delocalized electrons [11][12][13][14][15][16][17][18]. But for the present samples, the negative dielectric constant was not obtained.…”

Section: Resultscontrasting

confidence: 58%

Structure, morphology, dielectric, and impedance properties of (1-x) (Al0.2La0.8TiO3) + (x) (CuTiO3) (x = 0.2–0.8) nanocomposites

Reddy

Kumar

Babu

et al. 2021

J Mater Sci: Mater Electron

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1-x) (Al 0.2 La 0.8 TiO 3 ) ? (x) (CuTiO 3 ) (x = 0.2-0.8) [ALTCT] nanocomposites were prepared through hydrothermal process. The diffraction study indicated the formation of tetragonal structure expressing maximum intense peak at * 25.586 o for all samples. Lattice constants a = b and c values were found to be increasing from 3.774 to 3.780 A ˚, and 9.394-9.950 A ˚, respectively as a function of 'x'. The surface morphology showed that the formation of nanospheres, and hexagonal nanorods. Further, the dielectric behavior was studied, and the results showed space charge effect, dielectric relaxation dynamics, and frequency-dependent dielectric properties. Impedance and dielectric modulus formalism was carried out to elucidate the microstructure, polarization, and electrical conduction mechanism.

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Section: Resultscontrasting

confidence: 58%

Structure, morphology, dielectric, and impedance properties of (1-x) (Al0.2La0.8TiO3) + (x) (CuTiO3) (x = 0.2–0.8) nanocomposites

Reddy

Kumar

Babu

et al. 2021

J Mater Sci: Mater Electron

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“…When the power reaches 450 W, the electron density and electron collision frequency of plasma reach the maximum and then stay stable. At this time, microwave energy cannot penetrate 21 | decreases with the rise of power. This is due to the fact that with lower input power, the excited plasma electron density becomes lower accordingly, which makes the microwave easier to penetrate plasma, causing less reflection.…”

Section: Measured Results and Discussionmentioning

confidence: 99%

“…When the power reaches 450 W, the electron density and electron collision frequency of plasma reach the maximum and then stay stable. At this time, microwave energy cannot penetrate the inside of the plasma [21]. The loss of microwave energy no longer fluctuates with the increase in power.…”

Section: Measured Results and Discussionmentioning

confidence: 99%

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Dynamic Measurement of Relative Complex Permittivity of Microwave Plasma at Atmospheric Pressure

et al. 2021

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Complex permittivity is one of the most important parameters to characterize the interaction between microwave and medium, especially for microwave-excited plasma. It is convenient to study plasma’s dielectric properties and microwave propagation characteristics by measuring its complex permittivity. A dynamic measurement method of equivalent relative complex permittivity of microwave-excited plasma at atmospheric pressure is proposed in this paper. Firstly, a cavity based on WR-430 at a frequency of 2.45 GHz was specially designed in COMSOL. Then, the samples with different real parts of complex permittivity and loss tangent were simulated in the designed cavity to obtain their corresponding S parameters, and they were used to train the BP neural network until the error was lower than 0.001. A two-port network was built to excite the plasma. The input power, reflected power, and transmitted power could be measured by the transmission reflection method. Finally, the measured power values were converted into S parameters and used as inputs in the BP neural network. The plasma’s real parts of complex permittivity and loss tangent were obtained by inversion. The variation of plasma complex permittivity conforms to the interaction principles between microwave and plasma, which verifies the accuracy of the method.

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“…where ε ij , µ, and ξ c are the plasma electric permittivity tensor, the magnetic permeability, and the constant chirality parameter. Plasmas metamaterials have been investigated as new media endowed with interesting properties, such as negative refraction and nonlinearities [118,119].…”

Section: Introductionmentioning

confidence: 99%

Cold plasma waves in the chiral Maxwell-Carroll-Field-Jackiw electrodynamics

Ribeiro¹,

Silva²,

Ferreira³

2023

Preprint

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In this work, we study the propagation and absorption of plasma waves in the chiral Maxwell-Carroll-Field-Jackiw electrodynamics (MCJF). The Maxwell equations are rewritten for a cold, uniform, and collisionless fluid plasma model, allowing us to determine the new refractive indices and propagating modes. The case of transversal propagation is examined considering a purely timelike CFJ background that plays the role of the magnetic conductivity chiral parameter. We find four distinct refractive indices associated with RCP and LCP waves. For each index, the propagation and absorption zones are illustrated for some specific parameter values. The optical behavior is investigated by means of the rotatory power (RP) and dichroism coefficient. The existence of a negative refraction zone enhances the rotatory power. It is also observed RP sign reversal, a feature of rotating plasmas.

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Wave propagation in and around negative-dielectric-constant discharge plasma

Cited by 17 publications

References 38 publications

Structure, morphology, dielectric, and impedance properties of (1-x) (Al0.2La0.8TiO3) + (x) (CuTiO3) (x = 0.2–0.8) nanocomposites

Structure, morphology, dielectric, and impedance properties of (1-x) (Al0.2La0.8TiO3) + (x) (CuTiO3) (x = 0.2–0.8) nanocomposites

Dynamic Measurement of Relative Complex Permittivity of Microwave Plasma at Atmospheric Pressure

Cold plasma waves in the chiral Maxwell-Carroll-Field-Jackiw electrodynamics

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