Plasmonic nanoparticle monomers and dimers: From nano-antennas to chiral metamaterials

We review the basic physics behind light interaction with plasmonic nanoparticles. The theoretical foundations of light scattering on one metallic particle (a plasmonic monomer) and two interacting particles (a plasmonic dimer) are systematically investigated. Expressions for effective particle susceptibility (polarizability) are derived, and applications of these results to plasmonic nanoantennas are outlined. In the long-wavelength limit, the effective macroscopic parameters of an array of plasmonic dimers are calculated. These parameters are attributable to an effective medium corresponding to a dilute arrangement of nanoparticles, i.e., a metamaterial where plasmonic monomers or dimers have the function of "meta-atoms". It is shown that planar dimers consisting of rod-like particles generally possess elliptical dichroism and function as atoms for planar chiral metamaterials. The fabricational simplicity of the proposed rod-dimer geometry can be used in the design of more cost-effective chiral metamaterials in the optical domain.Comment: submitted to Appl. Phys.

Pion condensation of quark matter in the static Einstein universe

In the framework of an extended Nambu--Jona-Lasinio model we are studying pion condensation in quark matter with an asymmetric isospin composition in a gravitational field of the static Einstein universe at finite temperature and chemical potential. This particular choice of the gravitational field configuration enables us to investigate phase transitions of the system with exact consideration of the role of this field in the formation of quark and pion condensates and to point out its influence on the phase portraits. We demonstrate the effect of oscillations of the thermodynamic quantities as functions of the curvature and also refer to a certain similarity between the behavior of these quantities as functions of curvature and finite temperature. Finally, the role of quantum fluctuations for spontaneous symmetry breaking in the case of a finite volume of the universe is shortly discussed.Comment: RevTex4; 15 pages, 10 figure

Influence of plasma and radio-wave pre-treatments on seeds germination and seedlings phytosanitary conditions

This work is partly supported by the Belarusian Republican Foundation for Fundamental Research under the grant No Ф11СРБ-015

Femtosecond Pulses Chirping Compensation by Using 1-D Compact Multiple Defect Photonic Crystals

Transmission properties of ultrashort pulses propagating through one-dimensional photonic crystals with multiple defects cavities were experimentally investigated. Coupling between multiple cavities is responsible for a wide resonance inside the photonic crystal gap suitable to distortion free propagation of 70 fs pulses at 800 nm. Geometry-induced anomalous dispersion across the resonance allows a compensation of 15% chirp preinduced on Fourier transform limited 70 fs pulses

Biological effectiveness of plasma and electromagnetic field seeds treatments against plant pathogenic bacteria and fungi

An influence of RF air plasma and RF electromagnetic field pre-sowing treatments on germination and level of fungal and bacterial infection of seeds of some important agricultural plants has been studied. Two plasma systems (plan-parallel and cylindrical) were used for treatment. It is shown that the treatments provide a fungicidal and bactericidal effects and positively influenced seeds germination. The modification of seed coat surface structure is investigated with scanning electron microscopy

Biological effectiveness of plasma and electromagnetic field seeds treatments against plant pathogenic bacteria and fungi

An influence of RF air plasma and RF electromagnetic field pre-sowing treatments on germination and level of fungal and bacterial infection of seeds of some important agricultural plants has been studied. Two plasma systems (plan-parallel and cylindrical) were used for treatment. It is shown that the treatments provide a fungicidal and bactericidal effects and positively influenced seeds germination. The modification of seed coat surface structure is investigated with scanning electron microscopy

Mathematical model of the interaction between protons and matter

Abstract: The model of the interaction between protons and matter is developed. The processes of the proton slowdown by the electron subsystem of an atom, the elastic and inelastic scattering and the nuclear reactions are considered. The basic features of the ionization scattering energy losses and elastic ones are revealed. The comparative analysis of the yields of different nuclear reactions due to proton-atom collision are carried out. The model is intended for computing the radiative, heat and electromagnetic fields in the object being under proton radiation.Note: Research direction:Mathematical modelling in actual problems of science and technic