S.Y. Polevoy

Resonant features of planar Faraday metamaterial with high structural symmetry - Study of properties of a 4-fold array of planar chiral rosettes placed on a ferrite substrate

The transmission of electromagnetic wave through a planar chiral structure, loaded with the gyrotropic medium being under an action of the longitudinal magnetic field, is studied. The frequency dependence of the metamaterial resonance and the angle of rotation of the polarization plane are obtained. We demonstrate both theoretically and experimentally a resonant enhancement of the Faraday rotation. The ranges of frequency and magnetic field strength are defined, where the angle of polarization plane rotation for the metamaterial is substantially higher than that one for a single ferrite slab.

Experimental Study of the Faraday Effect in 1D-Photonic Crystal in Millimeter Waveband

The paper is devoted to experimental study of Faraday Effect enhancement. The experimental structure consists of photonic crystal, loaded with ferrite, which in turn is covered by thin metal layer or wire medium. An analysis of the transmission/reflection spectra for both unloaded and loaded photonic crystals shows that the surface oscillation mode (the surface state) is formed in the crystal band gap. A good agreement exists between experimental data and numerical calculations.

Technique for Analysis of the Spatial Field Distribution in Tapered Wire Medium

The paper is devoted to experimental investigation of the spatial distribution of electromagnetic field in the vicinity of the tapered wire medium formed by copper wires conductors in the millimeter waveband. The experimental technique, based on the small perturbations method and used the special software has been elaborated for electromagnetic field distribution registering. The optimal type of probe has been determined. The electromagnetic energy concentration in the vicinity of the narrow planes of the tapered wire medium has been demonstrated experimentally. It is shown that the width of the wave beam behind the narrow facet of the lens insignificantly increases with distance. The field patterns with resolution ± 0.01dB in the vicinity of wide planes of lens have been registered.

Resonant response in mechanically tunable metasurface based on crossed metallic gratings with controllable crossing angle

We report on a modern class of mechanically tunable planar metamaterials comprising resonating units formed by crossed metallic strip gratings. We observe a resonant response in transmission spectra of a linearly polarized wave passing through a system of crossed gratings in the microwave regime. Each grating consists of an array of parallel metallic strips located on the top of a dielectric substrate. It is revealed that the resonant position appears to be dependent on the angle of crossed gratings. It is found theoretically and experimentally that the resonant shift on the frequency scale appears as a result of increasing in the length of the resonating portion of the parallelogram periodic cell formed by the crossed metallic strips with decreasing crossing angle. The proposed design can be used in innovative types of planar metamaterials and filters.

Electromagnetic Wave Propagation in the Finite Periodically Layered Chiral Medium

The transmission and reflection coefficients of electromagnetic waves propagating through the finite periodically layered chiral structure are defined both theoretically (using the propagation matrix method) and experimentally. The coefficients of the propagation matrix of the periodically layered chiral medium are obtained. The boundaries of the forbidden bands for a periodic medium, whose unit cell consists of two different chiral layers were determined. It is shown that the boundaries of the forbidden bands do not depend on the chirality parameter of the layers. It is found that for certain values of the layers thicknesses, the forbidden band widths tend to zero and that the proposed method for calculation of the reflection and transmission coefficients can be used to determine the effective constitutive parameters of artificial chiral metamaterials. The transmission and reflection coefficients of plane electromagnetic waves propagated through the finite periodically layered chiral structure were determined experimentally for 20-40 GHz range. A good agreement between the experimental results and theoretical studies of the forbidden band spectrum for the structure under research has been shown.

Faraday rotation enhancement by gyrotropic metasurface

We obtained full-wave numerical solution of the plane wave scattering from two-layered structure performed as double-periodical array of gyrotropic parallelepipeds on dielectric layer by the method of integral functionals. It is shown that such structure at the resonant frequency demonstrates mostly complete polarization conversion of the transmitted plane wave with a significant transmission coefficient. It is demonstrated numerically that the resonance frequency of the given structure can be controlled by varying the thicknesses of the gyrotropic and dielectric layer.

Crossed metallic gratings as metasurface with tuned crossing angle

The paper is devoted to both theoretical and experimental study of the spectral characteristics of planar metamaterials formed by crossed metallic gratings with mechanically tunable crossing angle at the microwave band. We experimentally confirm the predicted presence of transmission resonance in the spectrum of this planar metamaterial, that is dependent on the metallic strip width, strips period and permittivity of dielectric slab. In addition, we show the strong dependence of resonance magnitude from inclination angle of the investigated structure with respect to the wavevector. Decreasing of the transmission resonance peak with the increasing the thickness of dielectric separation film, located between slabs of investigated structure, is demonstrated. Our results may open up possibilities for the design of spatial electromagnetic filters.

Microwave photonic band gap coaxial line

In the paper the spectrum of the photonic band gap structure which realized in a coaxial line is presented. It is shown that photonic band gap structure able to operate in the very broad frequency band: 10MHz-40GHz. The analytical calculation is in a good agreement with experiment.