FIG. 1: Im(n_eff) as a function of wavelength/pitch, for a structure of 8 rings of holes in silica at a wavelength of l = 1.55µm for several diameter on pitch ratios. Im(n_eff) decreases monotonically with increasing d/L, as this parameter takes the values 0.40 (1), 0.41, 0.42, 0.43, 0.45, 0.46, 0.48 0.49, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75 (14).

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