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FM-MKR with the improved ambient index sensitivity [29]. (a) Operation principle of FM-MKR; (b) effective refractive indices (neff(m)) with variations in the waist diameter depending on the radial mode number; (c) ambient index sensitivities with variations in the waist diameter (RIU: Relative index unit, SRI: Surrounding refractive index). Copyright 2018, IEEE.
