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30 March 2012 Determination of effective boundaries and material properties of SRR-rod and fishnet metamaterials
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To retrieve effective refractive indices, impedances, and material properties, such as electric permittivity (ε) and magnetic permeability (μ) of MMs, we propose a full extraction method allowing determination of properties over all frequencies of interest including the strong resonant band, where the results are unavailable by the well-known robust method proposed by Kong. The proposed method based on the material continuity can retrieve missing results in the strong resonant band where the imaginary part of permittivity or permeability is negative. Two optimization models proposed to determine effective boundaries of split-ring-resonator (SRR)-based and fishnet MMs are defined based on the assumption of effective medium theory and characteristic of homogeneous media. The results are then compared with the traditional definition proposed by Kong. Finally, the refractive index, impedance, permittivity, and permeability of two slabs composed of SRR-based and fishnet MMs, respectively, are retrieved by the proposed method.
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Feng-Ju Hsieh and Wei-Chih Wang "Determination of effective boundaries and material properties of SRR-rod and fishnet metamaterials", Proc. SPIE 8344, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2012, 83441D (30 March 2012);

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