Anisotropy, gyrotropy and dispersion properties of the periodical thin-layer structure of magnetic–semiconductor

Material parameters and microwave properties of a magnetic photonic crystal

“…Depending on the relative direction of three vectors H 0 , n, and k, various types of waves can propagate in the PCS [10,11].…”

“…Various approximate methods are used to describe microwave and optical characteristics of the PCS [8−11]. One of them is the longwave approximation of a thin-layer medium with a structure period much smaller than the wavelength of the propagating wave [6,10,11]. For the thin-layer approach to be valid in the millimeter and submillimeter ranges, which are of great practical interest, the structure period should be on the order of 1 μm.…”

“Left-handed” state and polarization characteristics of waves in “semiconductor-magnet” superlattices

“…The struc ture periodicity axis coincides with the OZ axis, i.e., 1). If the wavelength in either medium far exceeds the structure period (λ ӷ l), the PLS can be described as a homogeneous medium with effective tensor material parameters [6,7]. It is convenient to introduce the parameter Θ = l s /l f characterizing the ratio of semiconductor and magnet layer thicknesses.…”

“…It is convenient to introduce the parameter Θ = l s /l f characterizing the ratio of semiconductor and magnet layer thicknesses. For the structure under consideration, nonzero com ponents of effective permittivity and permeability ten sors are given by [7] (5)…”

“…Therefore, various approximate methods are used to describe wave processes in PLSs. One of such methods is the long wavelength approximation (thin ε f ε s μ f μ s layer medium approximation) which yields good results when the structure period is much smaller than the length of the propagating wave [6,7]. In this case, the PLS can be considered as a homogeneous medium with effective tensor material parameters and a disper sion that is characteristic of metamaterials.…”