Complex resonator with thin hyperbolic media inside is investigated in the way of developing theory of THz laser. The eigen waves of the cavity contains asymmetrical hyperbolic medium (AHM) based on graphene-semiconductor multilayer structure with optics axis tilted with respect to outer boundary have been calculated. To find optimal conditions for efficient THz lasing the optimal parameters of the cavity and AHM were estimated.
Gain saturation effect in the cavity with hyperbolic graphene medium is investigated. THz wave emission in the cavity was investigated numerically using transfer matrix method. It was assumed that the gain saturation appears as the decrease of imaginary part of effective dielectric permittivity. The intensity of THz radiation and the frequencies of oscillations have been calculated using recursive procedure.
THz wave emission in the cavity which contains the graphene-multilayer asymmetric hyperbolic metamaterials is investigated numerically using transfer matrix method. In was assumed that the gain saturation appears as the decrease of imaginary part of effective dielectric permittivity. Gain –loss balance predicts the intensity of THz lasing.
KEYWORDS: Wave propagation, Metamaterials, Electromagnetic radiation, Radiative energy transfer, Solids, Near field optics, Dielectrics, Free space, Near field
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.
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.
The reflection/transmission coefficients for the hyperbolic finite-thickness SiC-graphene slab are calculated using the 4x4 Berreman matrix method for arbitrary orientation of optical axis according to slab boundary. Gain or losses in the medium are described as imaginary parts of the components of dielectric tensor of the medium. The threshold conditions for gain of THz waves and radiation angle were calculated for given losses and axis orientation.
The dispersion characteristics characteristic of the hyperbolic metamaterial consists of graphene and semiconductor layers titled according to outer boundary are presented. The graphene – SiC structure seems promising due to realistic technology condition for its manufacturing. Possibility of control of the light propagating through such structure will be discussed.
We are carefully analyzing the properties of the eigenwaves of 2D-structure with regularly ordered metal nanorods in
lossless dielectric. Plane-wave-decomposition was used in numerical calculations. New “hyperbolic” solutions were
found.
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.
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.
We presented the theoretical and numerical approach to the computation of the optical characteristics of two-dimensional
photonic crystal structure with active medium and metallic nano-roads. The results of calculations of the spectral
characteristics of these structures are presented. The plane wave expansion method has been used.
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.
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.
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.
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.
The gain factor for the light propagating in one dimension (1D) photonic band-gap (PBG) structure having active layers with was calculated using the transfer matrix formalism. The frequency dependencies of the reflection and transmission coefficients, and threshold conditions of 1D photonic crystal with finite length are presented. The structure containing thin metal layers is considered also. Possible mechanisms of gain enhancement were discussed.
KEYWORDS: Dispersion, Photonic crystals, Wave propagation, Signal attenuation, Dielectrics, Refractive index, Radio propagation, Electromagnetism, Chemical species, 3D modeling
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.
General description of 1D photonic crystal structures is presented. Waveguiding and band-gap properties are treated simultaneously using of the generalization of Kronig-Penny model for TE and TM modes. Saddle points for TM polarization are observed in the regions where the light propagation is possible.
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