Metamaterials: Negative refractive index in ... - Theory.nipne.ro

Effective relative magnetic permeability (μ reff ) for thesplit-r<strong>in</strong>g resonators structureP<strong>in</strong>k band: frequency <strong>in</strong>terval of<strong>in</strong>terest, μ reff < 0μ reff = 1 – ω pm2 /(ω 2 – ω 0m2 + jωΓ m )In the picture Γ m≈ 0ω 0m- magnetic-type resonant frequency; ω pm- magnetic-type “plasma” frequency(geometry determ<strong>in</strong>es these two quantities bandwidth for μ reff < 0)Note: Similar behavior of ε reff for the periodic structure us<strong>in</strong>g metallic rodsreplac<strong>in</strong>g: μ reff ε reff ; ω pm ω pe(electric-type “plasma”); ω 0m 0ASTiGMAT