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4 May 2007 Magnetic response and negative refractive index of metamaterials
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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 1&mgr;m. 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 metamaterial. We discuss the connection of recently suggested alternative negative index metamaterial designs in a unified picture.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Th. Koschny, J. Zhou, and C. M. Soukoulis "Magnetic response and negative refractive index of metamaterials", Proc. SPIE 6581, Metamaterials II, 658103 (4 May 2007);

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