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Upper panel: Count rates increased non-linearly with laser power and varied for each type of particle: 11 nm diameter QDs (squares), 60 nm diameter gold colloids (circles), 110 nm diameter non-fluorescent latex beads (triangles), and 290 nm diameter fluorescent beads (upside-down triangles). Lower panel: Normalized diffusion times (τD) for each type of particles followed different trends and exhibited different magnitudes of deviation.
