Negative refractive index response of weakly and strongly coupled optical metamaterials

Details Negative refractive index response of weakly and strongly coupled optical metamaterials Negative refractive index response of weakly and strongly coupled optical metamaterials

2009-07-06

arxiv.org/abs/0907.1119v1

Physics

Optics

accepted to Phys. Rev. B

Scientific paper

e present a detailed study of the retrieved optical parameters, electrical permittivity, magnetic permeability and refractive index, 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 than 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.

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