# Bahram JaziUniversity of Kashan · Department of Laser and Photonics

Bahram Jazi

Dr.

## About

80

Publications

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935

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Introduction

Additional affiliations

January 2005 - January 2016

## Publications

Publications (80)

Using cold atmospheric plasma (CAP) could promise a breakthrough in the fight against cancer cells, providing an alternative to surgical and chemical therapies. Here, the reduction rate of the temperature of plasma nanosphere is simulated and studied after the injection of electromagnetic waves into it. For this purpose, the plasma nanosphere is ir...

In this paper, a long column lens with circular cross section made of two transversely non-isotropic parts (dielectric and plasma ) covered by isotropic dielectric layer, is studied. The response of the mentioned object to presence of plane monochromatic electromagnetic waves will be investigated. The finite element method (FEM) have been used to c...

Employing the dielectric tensor elements and taking into account the time variations of a rotating magnetic field (RMF) leading to the electric field generation responsible for particle acceleration, we develop a closed mathematical form for the radiated power absorbed by a long column containing multilayer inhomogeneous drift plasma with elliptica...

In this paper, a theoretical approach is presented for the electron azimuthal acceleration in a novel circular plasma waveguide. This special configuration includes a plasma column, whereas multiple parallel longitudinal cavities are located in it. Moreover, the plasma column surrounded by a dielectric tube, and the whole system is covered by a lon...

In this paper, a long column lens with a circular cross section made of two transversely non-isotropic dielectric parts covered by an isotropic plasma layer, is studied. The response of the mentioned object to the presence of plane monochromatic electromagnetic waves will be investigated. The finite element method has been used to calculate the fie...

The effects of the electron temperature on the dominant color in colloidal nano sphere solutions
are analytically studied. This system contains ions (as radiators) close to the hot nano plasma
spheres (HNPSs). Considering two separate models of the point radiated ions and applying the
fluid dynamic equations and suitable Green’s function, the optic...

This paper presents a theoretical study on terahertz (THz) radiation produced by the nonlinear interaction of two laser beams of Laguerre-Gaussian and Hermite-Gaussian profiles with axially magnetized ripple density plasma. The influence of the external magnetic field on the optimization process of the THz field amplitude and on the field profile o...

This paper presents an investigation of infrared (IR) radiation generation by nonlinear interaction of two visible laser beams in a metallic background. Two laser beams of Gaussian and Laguerre Gaussian (LG) profiles and background metals such as silver, copper, gold, and aluminum are utilized for IR generation. Effects of laser beam characteristic...

Scattering of an electromagnetic plane wave in transverse electric mode which is obliquely incident to an elliptical plasma antenna with a dielectric rod is comprehensively investigated. The field solutions of the incident, transmitted, and the scattered waves will be derived in terms of Mathieu and modified Mathieu functions. Using asymptotic expa...

In this work, a comparison between two different cases of an elliptical Cherenkov maser with two electron beams for the generation and amplification of terahertz electromagnetic waves has been presented. The waveguide is made of a hollow dielectric layer filled with a cold collisionless unmagnetised plasma. In the above-mentioned configuration, the...

A theoretical model has been considered for describing the generation of terahertz (THz) radiation via nonlinear interaction of Gaussian and Hermite-cosh-Gaussian laser beams in a plasma background. By using Maxwell's equations and taking into account the collision approximation for the plasma medium, the amplitude of the emitted THz wave is obtain...

Excitation of THz surface plasmons due to the scattering of transverse magnetic (TM) wave by an elliptical plasma antenna consisting of a metallic rod with dielectric coating is investigated. The incident, transmitted, and scattered electromagnetic waves are expressed in terms of Mathieu and modified Mathieu functions. The geometrical structure and...

The nonlinear interaction of Hermite-Gaussian and Laguerre-Gaussian (LG) laser beams with a collisional inhomogeneous plasma is studied, and the amplitude of the emitted terahertz (THz) electric field is evaluated. The effects of laser beams and plasma parameters, including the beams width, LG modes, the plasma collision frequency, and the amplitud...

The propagation of slow waves in a dielectric tube surrounded by a long cylindrical metallic waveguide is investigated. The dielectric tube located in a background region of plasma under two different states A and B. In the A-state the dielectric tube hollow filled with the plasma and in the B-state the outer surface of dielectric tube has been cov...

The effects of magnetic field on dominant color in a system including nano cold plasma spheres will be theoretically simulated. The main radiators are the ions close to these spheres. By applying suitable Green's function, the solutions of field equation, due to the scattered long-wavelength electromagnetic waves from the nano object will be declar...

In this paper, a novel waveguide made of a hollow long metallic cylindrical column with a transverse anisotropy dielectric rod (TADR) is studied. The dispersion relation of hybrid electromagnetic waves is obtained in this structure, and its diagram variations will be investigated. The effects of dielectric permittivity coefficients of TADR on the d...

In this work, the dispersion relation of hybrid electromagnetic waves propagating in a novel plasma cylindrical waveguide with a cold collisionless unmagnetized plasma column and a transverse anisotropy dielectric rod (TADR) is investigated. The dispersion diagram of the hybrid waves in this configuration is obtained. The effects of dielectric perm...

This article presents a formulation for the dielectric permittivity tensor in a long column of warm drift homogeneous plasma taking into account the drift velocity of the particles, the rotating magnetic field and the effects of the electron-ion collisions. In this formulation, the study of the waves propagating along the cylindrical axis is employ...

In this paper, a plasma waveguide made of two eccentric cylindrical metallic walls have been studied according to the theory of transmission lines. The inductance per unit length L, the capacitance per unit length C, the resistance per unit length R and the shunt conductance per unit length G are obtained. The graphs of variations of the mentioned...

Using the solutions of field equation, due to the electromagnetic wave scattering phenomena from a nano plasma sphere(NPS), the inserted force on nano plasma sphere is simulated. For this purpose, with using suitable Green?s function, the scattering phenomena of long wavelength electromagnetic waves from a nano plasma sphere will be investigated. A...

The scattering phenomenon of plane waves from an unstable elliptical plasma antenna is investigated. The role of surface plasmon excitation in the scattering pattern is studied. In the antenna mentioned above, there is a metallic rod with dielectric cover embedded in a long plasma column with an elliptical cross section. The antenna is considered u...

The problem of electromagnetic wave scattering from an elliptical plasma cylinder in the presence of an external oblique magnetic field is investigated. The electromagnetic waves are landed obliquely on the plasma column. Knowing the dielectric permittivity tensor of the plasma column, the electric potential and the electric field inside and outsid...

A theoretical model based on the classical theory for the simulation of scattering phenomena of long wavelength electromagnetic waves from plasmananowires is investigated. A line source as a monopole antenna radiator is considered, which radiates with frequency ω in the vicinity of plasmananowires parallel to the nanowire axis. A mathematical relat...

The effect of finite magnetic field on the excitation, generation, and amplification of slow electromagnetic waves at THz frequency in a magnetized plasma waveguide with elliptical cross section is investigated. In configuration mentioned above, there are two electron beams with opposite directions as energy sources, and the role of magnetic field...

In this procedure, the fundamental electromagnetic equations and fluid equations in a cylindrical coordinate system for a new drift plasma configuration have been analyzed. The system is a long
nonhomogeneous drift plasma column, which is embedded in a uniform transverse magnetic field rotating about the symmetric axis of the system. The elements o...

The wave propagation in a cylindrical metallic waveguide including a dielectric tube is investigated.
Two electron beams with opposite velocities are injected in the system as energy sources. It is shown
that one of the electron beams is responsible for Cherenkov radiation, the other one is as the stabilizer.
The dispersion relation of the waves, i...

The dispersion relation of terahertz hybrid modes in a plasma waveguide made of dielectric tube surrounded by long cylindrical metallic wall with elliptic cross section is obtained. The plasma region has been placed on outer surface of dielectric tube. The waveguide mentioned earlier is considered instable by the injection of two electron beams wit...

In this work, two stream instability in a metallic waveguide with elliptical cross-section and with a hollow annular dielectric layer is studied for generation and amplification of THz electromagnetic waves. Dispersion relation of waves and their dependents to geometric dimensions and characteristics of the electron beam are analyzed. In continuati...

While taking into account thermal motion of electrons, scattering of electromagnetic waves with low frequency from hot plasma spheroids is investigated. In this theoretical research, ions are heavy to respond to electromagnetic fluctuations. The solution of scalar wave equation in spheroidal coordinates for electric potential inside the plasma sphe...

The electromagnetic wave scattering from a dielectric rod placed in a non-coaxial thin annular magnetized relativistic rotating electron beam is simulated. The resonance frequency shift and the effective factors on it are investigated. In addition, the dependencies of pattern of scattering to the plasma frequency, the rotating frequency, geometrica...

The electromagnetic wave scattering due to excitation of surface plasmons from a metallic rod with dielectric layer embedded in the long plasma column is investigated. In the first part, for short-wavelength waves by investigating the variations of surface polarized charge density on the boundaries, the resonance frequencies and the effective facto...

The propagation of electromagnetic waves in an elliptical plasma waveguide including strongly magnetized plasma column and a dielectric rod is investigated. The dispersion relation of guided hybrid electromagnetic waves is obtained. Excitation of the waves by a thin annular relativistic elliptical electron beam will be studied. The time growth rate...

The energy distribution along the focal axis of a long metallic cylindrical parabolic reflector with a plasma layer on its surface in the presence of an external magnetic field is investigated. The effects of some physical parameters, such as the plasma frequency, the wave frequency and the thickness of plasma layer on the energy distribution and t...

In this paper, the scattering of long-wavelength electromagnetic waves from the rotating cold magnetized plasma spheroids is studied. The electric potential and the electric field for a rotating cold magnetized plasma prolate spheroid are obtained. The resonance frequencies and the functional relation of differential scattering cross section and th...

The deviation of the energy distribution along the focal axis of a long metallic cylindrical parabolic reflector, which on its surface contains a uniform cold collisionless plasma, is investigated. In addition, the effects of some physical parameters such as the plasma and wave frequencies and the thickness of plasma layer on this energy distributi...

Response of a prolate spheroid plasma and/or an oblate spheroid plasma in presence of long wavelength electromagnetic wave has been studied. The resonance frequencies of these objects are obtained and it is found that they reduce to the resonance frequency of spherical cold plasma. Moreover, the resonant frequencies of prolate spheroid plasma and o...

The scattering of a plane electromagnetic wave from dielectric rod surrounded by an eccentrically plasma layer is investigated. The graphs of backscattering cross section, scattering pattern and also their corresponding polarized charge density are presented. Investigation has been done on the effects of system parameters and axis separation on the...

The problem of the scattering of electromagnetic waves from a magnetized plasma column including a thin annular magnetized relativistic rotating electron beam is discussed theoretically. The backscattering cross-section and scattering pattern are presented for a transverse electric (TE) polarization. An investigation on the effects of system parame...

In the present Letter the transparency of a two-moving-magnetized-plasma-layer structure irradiated by an electromagnetic wave is investigated theoretically and its resonant conditions are determined. Here, the direction of the external magnetic field is normal to the plasma surface and two layers move with different velocities parallel to the inte...

The pattern of intensity due to the interference in a cold collisionless magnetized moving plasma slab is investigated. Theoretically, it is assumed the mentioned layer has been located as a thin layer in an etalon Fabry–Perot interferometer surrounded by vacuum. The direction of external magnetic field is normal to the plasma surface and the plasm...

Using dielectric permittivity tensor of the magnetized prolate plasma, the scattering of long wavelength electromagnetic waves from the mentioned object is studied. The resonance frequency and differential scattering cross section for the backward scattered waves are presented. Consistency between the resonance frequency in this configuration and r...

By using relativistic corrections in dielectric tensor elements of thin annular magnetized relativistic rotating electron beam (TAMRREB), the scattering of a plane wave from the mentioned object, including the dielectric rod, is investigated. The resonance frequencies and their variations versus the geometrical dimensions of the beam, its density,...

The excitation of surface plasma waves due to the interaction of an elliptical relativistic density modulated electron beam with the magnetized dusty plasma column with elliptical cross-section has been studied. The dispersion relation of surface plasma waves has been retrieved from the derived dispersion relation by considering that the beam is ab...

The dynamics and energy gain of an electron in the field of a transverse magnetic wave propagating inside an elliptical degenerate plasma waveguide is analytically investigated by finding the field components of the TMmr mode in this waveguide. Besides, by solving the relativistic momentum and energy equations the deflection angle and the accelerat...

In this paper, the reflection R and absorption A of an inhomogeneous dissipative magnetized plasma slab irradiated by an s-polarized electromagnetic wave are investigated analytically, and resonant transparency conditions are determined. Here, the direction of the external magnetic field is parallel to the plasma surface. The effects of the inciden...

The dynamics of an electron in the fields associated with a transverse magnetic wave propagating inside circular and elliptical waveguides is analytically studied. The field components of the TMmr mode in the circular and elliptical waveguides are calculated. The relativistic momentum and energy equations are solved for the electron when it is inje...

The reflection index of an unsteady moving magnetized plasma slab irradiated by an electromagnetic wave is investigated. The direction of the external magnetic field is parallel to the plasma surface and the electromagnetic wave is normally incident on a gas slab and produces the plasma. This gas slab is being ionized by another source and the dens...

The dispersion relation of guided electromagnetic waves propagating in an elliptical metallic waveguide with a dielectric rod driven by relativistic elliptical electron beam (REEB) is investigated. The electric field profiles and the growth rates of the waves are numerically calculated by using Mathieu functions. The effects of relative permittivit...

The distribution of the electric potential inside and outside a cold plasma column with elliptical cross-section when electromagnetic waves scatter from it are obtained. It is assumed that the wavelength of incident wave is much greater than the dimensions of the cross section of the plasma column. The electrical potential inside and outside a magn...

The surface plasma waves in a magnetized dusty plasma elliptical cylinder driven by elliptic relativistic electron beam propagating inside the elliptical cylinder are studied. The dispersion relation of surface plasma waves has been retrieved from the derived dispersion relation by considering that the beam is absent and there is no dust in the pla...

In this paper the pattern of intensity transmitted due to interference in a cold collisionless magnetized moving plasma slab is investigated. The direction of the external magnetic field is normal to the plasma surface and the plasma slab moves across relative to the magnetic field. By taking into account relativistic considerations, the effects of...

The excitation of electromagnetic waves due to the interaction of modulated density profile of an elliptical relativistic electron beam with the eigenmodes of a magnetized plasma column with elliptical cross section have been analyzed. Theoretically, it is shown that the Cherenkov and fast cyclotron interactions appear between the beam and eigenmod...

In this paper, effects of the thermal, collisional, and the inhomogeneity for density of charged particles on the dielectric permittivity tensor in the long column of multilayer magnetized plasmas with confocal elliptical cross sections are investigated. The dielectric permittivity tensor elements and the generalized field equations of each region...

Cited By (since 1996): 1, Export Date: 2 June 2011, Source: Scopus, doi: 10.1080/17455030.2010.497198, Language of Original Document: English, Correspondence Address: Jazi, B.; Department of Physics, Faculty of Science, University of Kashan, Kashan, Iran; email: jaziada@kashanu.ac.ir, References: Collin, R.E., (1992) Foundations for Microwave Engin...

Export Date: 2 June 2011, Source: Scopus, CODEN: PYLAA, doi: 10.1016/j.physleta.2010.09.034, Language of Original Document: English, Correspondence Address: Jazi, B.; Department of Physics, Faculty of Science, University of Kashan, Kashan, Iran; email: jaziada@kashanu.ac.ir, References: Krall, N.A., Trivelpiece, A.W., (1973) Principles of Plasma Ph...

The theoretical investigation of terahertz waves and their excitation by electron beam injection in a cylindrical metallic plasma waveguide is investigated. This metallic waveguide includes a cold collisionless unmagnetized annular degenerate plasma and a dielectric rod. The dispersion characteristics of these waves, the frequency spectra of fast a...

The dielectric constants (relative permittivities) of water, methanol, ethanol, butanol and acetone were measured at 91.3
kPa and (283.15 and 293.15) K and are reported here. The dielectric constants were determined by using a new setup based on
a low-pass filter. The obtained dielectric constant values are compared with those reported in the liter...

The effects of an external electromagnetic field on the binodal curve of the (water+propionic acid+dichloromethane) ternary system was investigated at 91.3kPa and T=(294.15 and 284.15)K. The experimental binodal curve values for the ternary system were obtained by the cloud point method using a new setup with a flat capacitor. The effects of variat...

The pattern of intensity transmitted due to the interference in a non-dissipative dispersive thin layer (NDDTL) is investigated.
For the layer mentioned the generalized relations for line width, power resolution, magnitude of the minima and visibility
of interference fringes are presented. Finally the interference patterns of a cold collisionless p...

The binodal (solubility) curves and tie line data for ternary systems of (water+propionic acid+dichloromethane) at 91.3kPa and T=(277.15, 284.15, and 294.15)K are reported. The binodal curve results were determined by cloud point measurements method. A simple titration method has been used for determining of the concentration of propionic acid in t...

M. Nejati, C. Javaherian, and B. Shokri responded to comments on the single-wall carbon nanotube waveguides and excitation of their σ + π plamons by an electron beam. The researchers stated that it was not important to note the variation in nanotube radius within the long wavelength limit for considering the dispersion curves of different radii app...

The sun tracking system of a solar dish based on computer image processing of a bar shadow is investigated. This is done by using a camera to obtain the optimized picture of a bar shadow on a screen by solar dish displacements. This system is independent respect to geographical location of the solar dish and periodical alignments such as daily or m...

By using the linearized two-fluid quantum hydrodynamic model for σ and π orbitals, the dispersion relations of electromagnetic waves in the single-walled carbon nanotubes are investigated. By injection of a relativistic electron beam, the excitation of electromagnetic waves in this system is studied. The graphs of operating frequency with respect t...

Cited By (since 1996): 1, Export Date: 2 June 2011, Source: Scopus, doi: 10.1007/s10762-009-9519-1, Language of Original Document: English, Correspondence Address: Jazi, B.; Department of Physics, Faculty of Science, University of Kashan, Kashan, I. R., Iran; email: jaziada@kashanu.ac.ir, References: Born, M., Wolf, E., (1975) Principles of Optics,...

The thermal effects on the frequency spectra and damping decrements of the waves propagating in a plasma of two nonisothermal different types of degenerate and nondegenerate charge carriers are investigated. This is done by obtaining the Fourier transform of the transverse dielectric tensor elements of an unbounded collisionless warm degenerate pla...

The dispersion relation of symmetric electromagnetic TM-modes in a cylindrical metallic waveguide with a magnetized degenerate plasma column protected by an annular dielectric layer are obtained. The permissible frequency regions for slow E-modes (TM) are presented. In addition, the time growth rate for excitation of these waves by a thin annular r...

By using the Fourier components of dielectric tensor elements of cold collisionless degenerate plasmas, the dispersion relation
of electromagnetic waves in a cylindrical metallic waveguide with a degenerate plasma column protected by an annular dielectric
layer are obtained. The permissible frequency regions for slow and fast waves in E-mode (TM) a...

By using the equilibrium equations for a hollow cylindrical piezoelectric layer in absence of body forces and taking into the account a magnetized electron beam in hollow region of this system the effects of thermal pressure, electrostatic self field and the strength of external magnetic field of a non-relativistic magnetized electron beam column o...

The dispersion relation of azimuthal electromagnetic surface waves in a rod dielectric magnetized plasma waveguide is obtained. It is investigated that these waves in E-type can be excited by a thin annular relativistic rotating electron beam (TARREB). The effects of the rotating velocity of beam, radius TARREB, on the frequency spectra and growth-...

By numerically solving the exact dispersion equation, the dispersion relation of symmetrical TM waves propagating in a Čerenkov maser including a thin annular relativistic electron beam (TAREB), a strongly magnetized plasma column, and a dielectric rod is investigated. The effects of accelerating voltage, radii of TAREB and plasma column as well, o...

The dispersion relation of symmetrical TM waves (usual operating mode of a traveling wave tube) propagating in a Cerenkov maser including a thin annular relativistic electron beam (TAREB), a strongly magnetized plasma column, and a dielectric rod is investigated. The effects of relative permittivity constant of dielectric rod, accelerating voltage,...

The dispersion relation for symmetrical TM electromagnetic surface waves propagating in a plasma waveguide with a strongly magnetized plasma column and a dielectric rod is investigated. The growth rate for excitation of these waves is obtained and its dependence on the radius of the annular beam, current intensity and accelerating voltage are inves...

The dispersion relation of azimuthal electromagnetic surface waves on a magnetized plasma column surrounded by a metallic cylindrical dielectric lined slow-wave waveguide is obtained. The permissible frequency region for these waves in E- and B-mode is presented. Furthermore, the graphs of frequency spectra and radial dependence of fields on the ex...

The dispersion relation of nonreciprocal electromagnetic surface waves propagating on the magnetized plasma–vacuum interface is obtained. Furthermore, the dependency of penetration depth on the magnetic field strength and its directivity is investigated. Finally, it will be shown that by an electron beam flowing on the plasma surface, aforementione...

The dispersion relation of azimuthal electromagnetic surface waves propagating perpendicular to the external magnetic field on an annular magnetized plasma rotating around the symmetric axis in a cylindrical metallic waveguide is obtained. The frequency region for E-modes and B-modes is investigated. Furthermore, the graphs of frequency spectra and...

The frequency spectrum of surface waves propagating on a semibounded non-relativistic magnetized plasma jet in the ion-acoustic frequency region is obtained. In addition, the effect of an external magnetic field on the modulation of a non-relativistic plasma jet when the external magnetic field is either parallel or perpendicular to the jet velocit...

The frequency spectra and damping rate of surface waves propagating along a plasma jet are obtained in both of high and low frequency region. Finally, the penetration of the static field in the plasma jet and filamentation of a subsonic plasma jet is studied.