Fast Electromagnetic Waves on Metamaterial’s Boundary: Modeling of Gain

Abstract

The paper presents the results of the study of properties of fast surface electromagnetic waves that propagate along the flat interface between the active metamaterial and air (or vacuum). The case of homogeneous and isotropic metamaterial is considered. The dispersion properties, the wave spatial attenuation, the phase and group velocities, as well as the spatial distribution of the electromagnetic field of the eigen TE and TM modes of such a waveguide structure are studied in the frequency range where the metamaterial has a simultaneously negative permittivity and permeability. It is shown that fast surface electromagnetic waves can exist in this waveguide structure and their properties are studied. It is shown that the phase speed of TM mode is several times higher than the speed of light in vacuum, while the phase speed of TE mode is slightly higher than the speed of light in vacuum. The TM mode is a direct wave in which the phase and group velocities have the same direction. It is obtained that the group velocity of the TM mode varies from zero to the about half of speed of light in vacuum, and reaches a minimum at a certain value of wave frequency, which depends on the characteristics of the metamaterial. It is shown that the penetration depth of the TM mode into the metamaterial is much smaller than into the vacuum. The TE mode is a backward wave with opposite directed phase and group velocities. The absolute value of the group velocity of the TE mode is about six times less than the speed of light in vacuum. In contrast to the TM mode the penetration depth of the TE mode into the metamaterial is much greater than in vacuum. The obtained properties of the fast surface electromagnetic waves can be used for modeling and design of modern generation and amplification devices containing metamaterials.

Slow Surface Eigenmodes Directed by the Mu-Negative Metamaterial Slab

“…It was studied the dispersion properties, spatial distribution of electric and magnetic field amplitudes of these eigenwaves of the considered structure for different problem parameters. It is necessary to mention the existence of new mode, as compared with previously studied simplified model [9]. This new mode can propagate in one mode regime and possesses the frequency range where its group velocity has a negative value.…”

“…Firstly, the main attention of researches was paid to the double negative (so-called lefthanded) metamaterials, with simultaneously negative value of permittivity and permeability [1,2]. These left-handed metamaterials are mainly interested with the possibility of realizing a negative refractive index for the creation of ideal lenses and other devices which contain such metamaterials [3][4][5][6][7][8][9]. Next, for these purposes there were also created mono-negative metamaterials, for example, with positive permittivity and negative permeability values -so called munegative metamaterials [10,11].…”