Isotropic left handed material at optical frequency with dielectric spheres embedded in negative permittivity medium

Abstract

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Comparing guided modal properties of surface waves along single- and double-negative indexed slab waveguides

“…As mentioned earlier, the slab waveguide structure is one of most simplest and fundamental guiding structures being used in lots of applications in microwave and optics regimes and its SNG / DNG counterparts are advantageous in subwavelength modal dimensions, for an instance, over the conventional dielectric slabs. In light of the possibility for the experimental feasibility, it should be mentioned that the arbitrary values of DPS/SNG/DNG material constants can be effectively realized through several different appro− aches such as metallic wires [22]/split ring resonators [23], photonic/electromagnetic crystals [24,25], magneto−dielec− trics [25][26][27], dielectric spheres [27,28], among many oth− ers. So, the slab structure of finite height like shown in Fig.…”

A Negative Refractive Index Metamaterial Based on a Cubic Array of Layered Nonmagnetic Spherical Particles

“…In [14], a similar idea is proposed, but in which one set of spheres are of ordinary dielectric material and contribute to a negative permeability, while the other set is composed of a plasma semiconductor, which contributes a negative permittivity. A variation on this idea was proposed in [15], wherein only one set of purely dielectric spheres is used (to generate negative permeability), but embedded in a negative permittivity host (such as semiconductor plasma). Wheeler et al [16] (and later Yannopapas [17]) have proposed a lattice of two-layered spheres, in which one layer is ordinary dielectric and the other a semiconducting plasma, in order to realize a negative-index medium.…”

Optically isotropic negative index of refraction metamaterial

“…free space or air) randomly doped with small gold (Au) spherical inclusions. We should mention that our optically isotropic metamaterial is different from the structures studied by Yannopapas and Moroz [10], and Seo et al [17]. In Ref.…”

“…A metamaterial based on the random distribution of dielectric gallium phosphide (GaP) spheres embedded in a negative homogeneous permittivity medium, cesium (Cs), was recently reported by Seo et al [17] The calculations, based mostly on the effective medium approach, have shown that the structure should exhibit optically isotropic negative refraction index effect in the visible at ∼520 nm. This Cs-based metamaterial, due to the high Drude losses 0 p / 0.25 γ ω in the solid Cs host [25], has an estimated large loss ratio, k = |Im (n)/Re (n)| > 1 [17] ( 0 γ , p ω are the damping constant and the plasma frequency of Cs, respectively). A small loss ratio is actually a strict requirement and several recently reported [13] anisotropic NIM's at the optical range provide k < 1.…”