We present a detailed study of the retrieved optical parameters, electrical permittivity ε, magnetic permeability μ, and refractive index n of the coupled-fishnet metamaterial structures as a function of the separation between layers. For the weak-coupling case, the retrieved parameters are very close to the one-functional-layer results and converge relatively fast. For the strong-coupling case, the retrieved parameters are completely different from the one-unit fishnet results. We also demonstrate that the high value of the figure of merit [FOM= | Re (n) /Im (n) |] for the strongly coupled structures is due to the fact that the real part of the negative n moves away from the maximum of the imaginary part of n (close to the resonance), where the losses are high. © 2009 The American Physical Society.
CITATION STYLE
Zhou, J., Koschny, T., Kafesaki, M., & Soukoulis, C. M. (2009). Negative refractive index response of weakly and strongly coupled optical metamaterials. Physical Review B - Condensed Matter and Materials Physics, 80(3). https://doi.org/10.1103/PhysRevB.80.035109
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