The effective optical constants of fishnet metamaterial are affected by the surrounding dielectric material or layersAnalytical formulas were derived to retrieve the effective optical constants of fishnet metamaterial surrounded by differentbulk materials, from reflection and transmission coefficients, and the effective optical constants of the fishnet embeddedin thin film layers stack were retrieved numerically. With increase of the refractive index of the surrounding dielectricmaterial as well as of the thickness of the nearby dielectric layers, the plasmonic resonance spectral position undergoesredshift while the absolute maximum value of negative refractive index of fishnet decreases.
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