Fig. 2
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Spatial mode coupling: minimal value of the effective refractive index neff as a function of the distance p2 between the two resonators. The side lengths of the resonators are am = 60 μm and ae = 90 μm, respectively. Insets: real (purple) and imaginary part (green) of the effective index neff; the shaded area denotes the bandwidth of negative effective index.
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