Magnetic response and negative refractive index of metamaterials - art. no. 658103

TitleMagnetic response and negative refractive index of metamaterials - art. no. 658103
Publication TypeBook Chapter
Year of Publication2007
AuthorsKoschny T, Zhou J, Soukoulis CM
EditorKuzmiak V, Markos P
Book TitleMetamaterials II
PublisherSpie-Int Soc Optical Engineering
Series TitleProceedings of the Society of Photo-Optical Instrumentation Engineers (Spie)
ISBN Number0277-786X978-0-8194-6709
Accession NumberISI:000250370100002
KeywordsLHM, magnetic response, metamaterial, negative index, optical frequencies, split-ring resonators, SRR, THz, transmission

We study the scaling of negative magnetic response of the SRR from microwave to upper THz frequencies. We show, that the linear scaling breaks down for SRR sizes below the order of lpm. This breakdown is due to the contribution of the finite electron mass to the inductance of the effective LC oscillator. While at microwave frequencies metals can be treated as near-perfect conductors, close to optical frequencies they rather constitute lossy negative dielectrics. We also study the scaling of the losses in SRR as well as the higher order excitations or plasmon modes and their magnetic response. We discuss the non-resonant diamagnetic response of the SRR and the corresponding corrections to the shape of the frequency dependent effective permeability of the metarnaterial. We discuss the connection of recently suggested alternative negative index metarnaterial designs in a unified picture.