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(a) Simulation geometry, giving (b) distribution of fields perpendicular to NP surface for dipolar and quadrupolar modes labeled as n = 1, 2. (c, d) Spectral dependence of maximum field in the gap (near-field) and scattering (far-field) for first few n. D is the diameter of the nanoparticle. (e, f) Phase of n = 1, 2, 3 in the far-field (f) and in the center of the gap (near-field, e).
