On the electrodynamics of semiconductor magnetoplasmic waveguides

The dispersion of magnetoplasmons propagating along the surface of a metamaterial with periodic well-conducting semiconductor or metallic inclusions under the application of a strong external magnetic field along the propagation direction is considered. The tensor of the effective dielectric constant of a metamaterial in the presence of a field is found on the basis of the effective medium method. It is shown that in the THz range there are delayed magnetoplasmons with low losses, i.e. such a structure with a flat surface behaves like a decelerating system and can be used in an TWT with magnetic induction of the order of 1Tl, which is necessary for focusing a ribbon electron beam. The magnetic field effectively controls the dispersion.