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(a) Log–log off-time distribution compiled from single Cy5 molecules on glass substrate. The solid line is the best fit with a power law exponent αoff = 1.74. Histograms of average off times of (b) single fluorophores on bare-glass substrates, (c) single fluorophores immobilized on silvered surfaces and (d) single fluorophores coupled to silver nanoparticles.
