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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...
A periodic Dielectric Frequency-Selective Surface (DFSS) is studied under 3D plane-wave incidence, whose unit cell in the periodic direction is composed of a dielectric grating and a homogeneous dielectric layer. The structure is excited by a linearly polarized plane-wave. The procedure for computing the Brillouin diagram of the structure under 2D plane-wave incidence with TE or TM polarization was...
This paper presents a numerical study of the electromagnetic wave propagation in dielectric loaded circular quadruple-ridged waveguide (CQRW) by the edge element method. The variations of the cut-off wavelength and single-mode bandwidth with the ridge dimensions for different values of dielectric constant are studied in detail. The numerical results in this paper provide an extension to the design...
The frequency-dependent finite-difference time-domain (FDTD) method has widely been used to treat dispersive materials, e.g., metal at optical frequencies, semiconductors at THz frequencies, water at microwave frequencies, and so on. Unfortunately, the time step size is restricted by the Courant-Friedrichs-Lewy (CFL) condition even for the frequency-dependent FDTD method. To remove this restriction,...
Floquet-Bloch Theory is one of the most rigorous numerical methods to analyze the properties of grating structures. By using Floquet-Bloch theory, the electric and magnetic fields are assumed to consist of an infinite number of space harmonics when an electromagnetic wave propagates in periodic structure of a dielectric waveguide. If a space harmonic is in the fast wave region of the dispersion relationship,...
Nanowaveguides containing ZO, AZO, GZO and other materials are studied in infrared range. The dispersion relation for the waveguides contained an arbitrary number of layers is solved numerically. The integral-differential equations in vector form of the electromagnetic waves propagation in nanowaveguides containing a finite width plasmon films are calculated by the Galerkin method and the effective...
The energy-momentum dispersion relation is a fundamental property of plasmonic systems. In this paper, we show that the method of dispersion engineering can be used for the design of ultra-compact graphene-based superscatterers. Based on the Bohr model, the dispersion relation of the equivalent planar waveguide is engineered to enhance the scattering cross section of a dielectric cylinder. Bohr conditions...
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