Abstract
Metamaterial structure based on epoxy resin nanoparticles positioned on mica glass substrate is proposed in order to produce negative refractive index. Complex reflection and transmission coefficients (S-parameters) are computed using CST MWS, based on finite integration technique (FIT) which is equivalent to FDTD when applied to Cartesian grids in the time domain. Effective refractive index, effective permittivity and effective permeability were extracted from the simulated S-parameters by using CST MWS extraction method which is done by using template pots-processing features. The real part of the refractive index is found to be negative at wavelengths where both real parts of the permittivity and permeability are negatives without using split ring resonators and thin wires.
Highlights
Left handed materials or metamaterials with simultaneously negative electric permittivity and negative magnetic permeability have attracted great attention in recent years because of their unique electromagnetic behaviors which cannot be found in naturally occurring materials (Veselago, 1968; Smith, Pendry, & Wiltshire, 2004; Pendry & Smith, 2004; Shelby, Smith, & Schultz, 2001)
We investigate numerically non-metallic non-dielectric epoxy resin nanoparticles positioned on mica glass substrate as a potential candidate for optical metamaterials
Design and Simulation The proposed MTM unit cell used in the simulation is shown in Figure 1 and Figure 2, where epoxy resin nanoparticles of 20 nm radius and permittivity εr = 4, positioned on a substrate of mica glass with effective thickness d=70 nm and permittivity εr = 6.7 at visible light wavelengths
Summary
Left handed materials or metamaterials with simultaneously negative electric permittivity and negative magnetic permeability have attracted great attention in recent years because of their unique electromagnetic behaviors which cannot be found in naturally occurring materials (Veselago, 1968; Smith, Pendry, & Wiltshire, 2004; Pendry & Smith, 2004; Shelby, Smith, & Schultz, 2001). There are several diverse alternative methods to verify whether or not a structure is a metamaterial, such as Snell’s law experiment (Shelby, Smith, & Schultz, 2001), flat slap imaging (Pendry, 2000), negative beam shift (Ran, Huangfu, Chen, Zhang, Chen, Grzegorczyk, & Kong, 2004), negative Goos Hanchen shift (Berman, 2002), reversal Cherenkov radiation and reversal of Doppler shift. CST microwave studio, ANSOFT HFSS, and COMSOL are well known as commercial software and as electromagnetic computational tools that can present simulations in 2D and 3D. The real part of the refractive index is found to be negative at wavelengths where both real parts of the permittivity and permeability are negatives
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