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Employing nonlocal homogenization approach, we investigate the properties of a metamaterial consisting of parallel metallic wires with dielectric coating. We demonstrate that manipulation of dielectric contrast between wire dielectric shell and host material at fixed frequency results in dynamic switching of metamaterial dispersion regime from elliptic to the hyperbolic one, i.e. the topological transition...
We show that surface plasmon polaritons (SPP) localized at anisotropic conductive interfaces possess a number of unique features. The interface is described as a two-dimensional current distribution of zero thickness by using a conductivity tensor. The dispersion of such SPP consists of two branches of hybrid TE-TM polarized modes. We reveal that, in contrast to bulk plane waves and conventional surface...
We analyse and compare the effects of the spatial dispersion and structural anisotropy on the spectrum of a metamaterial slab. Dielectric function of the slab we describe within Drude-Lorentz approximation. Anisotropy is of the slab is introduced through the anisotropy of plasma frequencies corresponding to the different component of the permittivity tensor. Spatial dispersion is considered within...
We analyze spectrum of waveguide modes of an arbitrary uniaxial anisotropic metamaterial slab with non-local electromagnetic response whose permittivity tensor could be described within Drude approximation. Spatial dispersion was introduced within the hydrodynamical model. Both anisotropy and spatial dispersion were considered as perturbations. Spatial dispersion is shown to result in suppression...
We propose new type of temaperature tunable metamaterial based on semiconductor superlattice for THz applications. We have shown that temperature activation of donors in semiconductor metamaterial results in drastic changes of the dielectric function in terahertz region. We have analyzed that the shape and topology of equal frequency contours depending on the external temperature. It was shown that...
The classical effective medium theory is usually applied to calculate a permittivity tensor of a multi-layered structure. The main assumption of this theory is that the thickness of a single layer should be less that the light wavelength. However, when the thicknesses of the layers are comparable with the electron wavelength we should take into account the tunnel transparency of the layers and the...
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