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(a) Evolution of extinction spectra over a wide range of particle sizes for gold nanospheres in water, normalized to the maximum extinction for each value of the diameter, 2R. (b–h) Near-field enhancement maps for dipolar, quadrupolar and octupolar modes in particles of different diameters, corresponding to the symbols superimposed in the upper contour plot. Adapted from Myroshnychenko et al. (2008). Copyright © RSC Publishing (2008).
