Olga N. Kozina

Plasmonic Coaxial Waveguides with Complex Shapes of Cross-Sections

In this paper, we describe waveguide properties of new optical waveguides made of noble metals and filled with glass and air. Such waveguides are coaxial cables and differ from a conventional coaxial in the shape of their central rods. Coaxial waveguide with annular and elliptic central rods are considered. Numerical simulations demonstrate that these waveguides, having nanosize cross-section, support propagation of few comparatively low-loss modes, having phase velocity close to the speed of light and the fields localized in a small area outside a metal. We illustrate excitation of these coaxial modes by dipole-like sources.

Laser action in 1D photonic band-gap structure with active layers

We present the results of calculations of the transmission/reflection characteristics of finite length 1D PC with air-glass-doped layers. For these calculations we used the transfer matrix formalism. We present also the results of calculation accounting nonlinear deformation of the field distribution along the structure due to gain and refraction index saturation. The results of calculations of laser power are presented on the dependence from gain.

Dispersion characteristics of 1D photonic crystals with passive and active layers

The gain/attenuation factor for lightwave propagating in 1D photonic band-gap (PBG) structure having layers with gain/losses was calculated using Kronig-Penny model. Special attention was given to the dispersion characteristics near the boundary of band gap. To distinguish between the directions of propagation, gain and attenuation the complex frequency of eigenwaves was used in the spirit of the theory of instabilities. It was shown the presence of bad gaps does not lead to considerable gain/loss enhancement and the gain is definitely absent within the band gaps. Possible mechanisms of gain enhancement were discussed.

Laser effect in nonlinear 1D photonic crystal

We present the results of calculations of the spectral characteristics of finite length 1D PC with air-glass-doped layers. For these calculations we used the transfer matrix formalism. We present also the results of calculation accounting nonlinear deformation of the field distribution along the structure due to gain and refraction index saturation. The results of calculations of laser power are presented on the dependence from gain.

Wave propagation characteristics in the cavity with hyperbolic medium

Electromagnetic waves propagation in the complex cavity with anisotropic hyperbolic metamaterial are investigated using direct calculation of modal field and dispersion equation. The transfer matrix method was adopted for arbitrary orientation of optical axis according to slab boundary. Increasing of the density of states in the cavity have show.

Density of states in complex cavity with hyperbolic medium

Electromagnetic radiation in the complex cavity with anisotropic hyperbolic metamaterial are investigated using direct calculation of modal field and dispersion equation. Anisotropy of the hyperbolic media slab was taken into account. The 4x4 Berreman matrix method was adopted for arbitrary orientation of optical axis according to slab boundary.

Optimization of field propagation in optical coaxial nano-waveguides of complicated-form

The properties of new optical waveguides with nanosize cross-section made of noble metals and glasses are described. As was found, this waveguide supports propagation of modes with unusual propagation properties. For estimation of the field localization, losses, propagation length, velocity and others characteristics the numerical simulations by FEM method has been used. The set of advanced structures are studied: a conventional coaxial; a coaxial waveguide with periodically arrange metal tubes for reducing the metal part in the structure; the coaxial waveguides with elliptic-type central rod and two cross ellipses. The effects of the asymmetry of the central part those structures have been estimated. The comparison of the results of this investigation by wavelength deviation has been performed. A combination of noble metal plus active glasses has been estimated towards minimization of losses. The power flow distribution for different types of modes is investigated. The best characteristics can be achieved for the dipole-like modes which can be excited by an external dipole.

Fast localized modes propagating in optical metal coaxial waveguides

In this paper we propose new optical waveguides, made of glasses and noble metals. Such waveguides are like coaxial cables where inner metal rods are replaced by thin metal annuluses filled with a glass inside. Numerical simulations demonstrate that the proposed waveguide, having nanosize cross-section, supports propagation of modes, which phase velocity is close to the speed of light and which field is localized outside the metal. These modes are dipole-like modes and are characterized by comparatively low losses.

Photonic crystal laser based on activated glass

We present the results of calculations of the generation condition of laser with 1D and 2D PC structures. The spectral and spatial characteristics of finite length 1D and 2D PC with air-glass-doped layers was examined. For these calculations we used the transfer matrix formalism. The lazing optimum condition is determined.

Spatial characteristics of radiation of 1D photonic crystal laser

We present the results of calculations of the spectral and spatial characteristics of finite length 1D PC with air-glass-doped layers. For these calculations we used the transfer matrix formalism. We present also the results of calculation accounting nonlinear deformation of the field distribution along the structure due to gain and refraction index saturation. The results of calculations of laser power are presented on the dependence from gain and from angle of propagation. The lazing optimum condition is determined.