Yuliya S. Dadoenkova

Surface plasmon polariton amplification in a single-walled carbon nanotube

The interaction of a surface plasmon polariton wave of the far-infrared regime propagating in a single-walled carbon nanotube with a drift current is theoretically investigated. It is shown that under the synchronism condition a surface plasmon polariton amplification mechanism is implemented due to the transfer of electromagnetic energy from a drift current wave into a terahertz surface wave propagating along the surface of a single-walled carbon nanotube. Numerical calculations show that for a typical carbon nanotube surface plasmon polariton amplification coefficient reaches huge values of the order of 106 сm-1, which makes it possible to create a carbon-nanotube-based spaser.

Thermal dependence of the lateral shift of a light beam reflected from a liquid crystal cell deposited on a magnetic film

We study the influence of the thermo-optic effect and of thermal expansion on the lateral shift experienced by a Gaussian near-infrared beam upon reflection from a voltage-controlled nematic liquid crystal cell deposited on a magnetic yttrium-iron garnet film. Variations of temperature are considered in the range between room temperature and the nematic-isotropic phase transition temperature of the liquid crystal and induce changes in both the layer thicknesses and the permittivity tensor components of the constituents. We show that for all polarization configurations of the incoming and reflected beams, these changes modify the amplitude of the extrema of the lateral beam shift and their position with respect to the incidence angle of the beam and, except in the s–s polarization configuration, to the voltage applied to the liquid crystal cell. In the p–p and p–s polarization configurations, this drift can thus be controlled at some incidence angles by tuning the applied voltage. Moreover, in the p–s conf...

Faraday Effect in Bi-Periodic Photonic-Magnonic Crystals

We present a theoretical investigation of the polarization plane rotation at light transmission—Faraday effect, through 1-D multilayered magneto-photonic systems consisting of periodically distributed magnetic and dielectric layers. We calculate Faraday rotation (FR) spectra of photonic-magnonic crystals, where cell (or supercell) is composed of magnetic layer and dielectric layer (or section of dielectric photonic crystal). We found that the FR of p-polarized incident light is increasing in the transmission band with the number of magnetic supercells. The increase of FR is observed also in vicinity of the band-gap modes localized in magnetic layers but the maximal polarization plane rotation angles are reached at minimal transmittivity. We show that presence of linear magneto-electric interaction in the magnetic layers leads to significant increase of the FR angles of s-polarized incident light in the vicinity of the fine-structured modes inside the photonic-band-gap.

Magneto-optical Kerr effect in a dielectric film with cubic optical nonlinearity on a magneto-electric slab

We investigate magneto-optic Kerr effect at light reflection from a nonlinear optical dielectric film on a bigyrotropic magneto-electric slab. We analyzed the optical nonlinearity and the magneto-electric coupling contributions to the Kerr rotation angles for both s- and p-polarized light at the incidence angles close to pseudo-Brewster angles.

Transmission spectra of one-dimensional bi-periodic photonic crystals

We investigate the transmittivity spectra of the electromagnetic waves for 1D bi-periodic dielectric photonic crystals of the structure [(AB)^NC]^M(AB)^N created on basis of the oxide layers TiO<inf>2</inf>, SiO<inf>2</inf> and Al<inf>2</inf>O<inf>3</inf>. The spectra modifications with the change of the incidence angle of light, period numbers and the layers thicknesses are considered.

Voltage-Tunable vapour detector using optical beam shifts in a magneto-electric multilayered structure

We investigate the spatial and angular lateral shifts of a Gaussian light beam reflected from a structure consisting of a nematic liquid crystal cell sandwiched between semi-transparent indium-tin oxide electrodes and deposited on a magneto-electric yttrium-iron garnet film grown on a non-magnetic dielectric gadolinium-gallium garnet substrate. We show that the external voltage applied to the liquid crystal cell allows an efficient tuning of the beam shifts. We propose a scheme for a vapour detection technique based on the measurement of the lateral shift variations induced by tiny changes of the relative permittivity of the air surrounding the system.

Surface Plasmon Polariton Amplification in a Single Carbon Nanotube by Direct Electric Current

A mechanism of amplification of surface plasmon polaritons due to the transfer of electromagnetic energy from a drift current into a terahertz surface wave propagating along the single-walled carbon nanotube is proposed.

Electrically pumped spaser based on semiconductor film / graphene / dielectric structure

We propose a model of slow surface plasmon polariton distributed feedback laser (spaser) with pump by drift currents in graphene. This model is a kind of hybrid of a distributed feedback laser and a well-known in microwave technology travelling-wave tube. The amplification of SPP wave is created by drift currents in the graphene, and the feedback is realized due to a periodic change of the semiconductor film thickness.We propose a model of slow surface plasmon polariton distributed feedback laser (spaser) with pump by drift currents in graphene. This model is a kind of hybrid of a distributed feedback laser and a well-known in microwave technology travelling-wave tube. The amplification of SPP wave is created by drift currents in the graphene, and the feedback is realized due to a periodic change of the semiconductor film thickness.

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

Magneto-optic waveguide and dielectric photonic crystal as a new complex structure for photonics

The dispersion and polarization properties of the electromagnetic waves in a multilayered structure composed of a magneto-optic waveguide on dielectric substrate covered by a one-dimensional dielectric photonic crystal are investigated theoretically. Different regimes of modes propagation inside such structure depending on the system parameters are studied.