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Real (blue) and imaginary (red) parts of the effective refractive index calculated by EMT. The gold FFs are 2%, 5%, 10%, and 15%. The bluer (redder) the lines are, the higher the FF is. The constant values (green) are the effective refractive indices after removing the gold nanoparticles from the lattices with FF = 10%, 20%, and 30%. The lighter the lines are, the higher the FF is.
