Anton P. Anzulevich

Penetration of Microwave Radiation into and through Metallic Powders

. It is known that bulk metallic samples reflect microwaves (MWs) while metallic powdered samples can absorb such radiation and be heated efficiently. The present paper shows a direct evidence of penetration of MW radiation into and through a layer of metallic powder and contains theoretical explanation of such behavior.

Simplified Core-Shell Model of Biochar - Iron Ore Mixture for Calculation of Effective Permittivity and Permeability

The simplified model of biochar-bearing iron ore with binder was studied. It was considered a mixture of two types of core-shell particles, ‘iron ore – binder’ particles and ‘biochar – binder’ particles. The expressions to calculate complex effective permittivity and permeability was derived by effective medium approximation (EMA). The corresponding dependencies on volume fraction of iron ore in the mixture are provided.

Core-shell biochar-bearing iron ore powder model for calculation of effective electrodynamic parameters

The simplified model of biochar-bearing iron ore with binder was studied. It was considered to be a mixture of two types of core-shell particles, iron ore - binder particles and biochar - binder particles. The expressions to calculate complex effective permittivity and permeability was derived by effective medium approximation (EMA). The corresponding dependencies on volume fraction of iron ore in the mixture are provided.

Negative group velocity waves in rectilinear thin wires array

A well-known metamaterial consisting of rectilinear thin wires array forming a 2D-square lattice within the non-conductive matrix was theoretically investigated in this paper. The frequency dependencies of wavelength of smoothed electromagnetic field distributions inside the wired structure, show that this material has a wide band in which there are negative group velocity waves. This effect is clearly observed in the case when the wavelength of the smoothed distribution of the electromagnetic field is much longer than the distance between the wires. For this case, also figures of field distribution from point source were modeled. They show that negative refraction and focusing of electromagnetic radiation observed, ie. the studied material is left-handed. Unlike most of the left-handed metamaterials that are composed of two separate inter-elements (typically, a split ring and a rod), in this paper it is proposed to use only one type of inclusion, namely the conductive rod.

Surface plasmon polariton amplification in semiconductor film / graphene / dielectric structure by direct electric current

Surface Plasmon Polariton Amplification in Semiconductor Film [Текст] / Graphene / Dielectric Structure by Direct Electric Current

Dependencies of dynamical magnetic losses in conductor-coated dielectric particles on radius of dielectric core, thickness and conductivity of conductive shell

In this work, we modeled dielectric spherical particles covered by metallic layer. We obtained dependencies of real and imaginary parts of the effective permittivity and permeability of powders from metalized dielectric particles on the frequency, radius and permittivity of the particle, thickness and conductivity of the metallic layer. We used finite element method for calculation of the electromagnetic fields in the investigated model and combination of impedance lows for ideal conductor and ideal magnetic mirror to calculate effective electrodynamics parameters. Novel technique for calculation of effective permittivity and permeability from results of direct calculations of electromagnetic fields in the model is provided in this paper. The imaginary part of the effective permeability is large enough compared with imaginary part of the effective permittivity and reaches its maximum values at the thickness of the metallic layer less than the skin depth. Therefore, microwave heating of such particles is d...

Modeling of Interaction Layers from Conductive Microparticles with TE Electromagnetic Wave

Dependences of distribution, penetration, reflection and absorption of microwaves in the layers of conductive micro-particles on the frequency of the incident radiation and size of particles are obtained and investigated. Layers of conductive spherical particles as the shell, and without it are accepted in our work as the most common model of powder metals. So, this study allows to describe and classify features of electromagnetic wave heating of various metal powders and to predict the performance, in which it will be effective heating of metal powders by electromagnetic radiation.

Quarter-wave splitter based on heterogeneous composite with prolate silver nanoparticles

The optical properties of an ultra-thin composite slab with uniformly oriented silver nanoparticles are investigated. It is shown that anisotropic plasmonic resonances in nanoparticles lead to strong polarization-dependent reflectance and transmittance in the visible region of light.

Microwave Heating of Metallic Powders

It is known from experimental data that bulk metallic samples reflect microwaves while powdered samples can absorb such radiation and be heated efficiently. In the present paper we investigate theoretically the mechanisms of penetration of microwave radiation through a layer of metallic powder and microwave heating of such system.