Fig. 3.

Coupling strengths of the nanoparticle-molecule systems. Coupling strengths g for different numbers N of molecules placed 3 Å above the nanoparticle. The symbols denote fitted g values from the data of Fig. 2. The dotted lines mark the ideal theoretical coupling strengths $g=\sqrt{N}{\mathrm{\mu }}_1{E}_{\mathrm{vac}}$, while the dashed lines mark the ideal dependence multiplied with efficiency factors η of η₂₀₁ = 0.47, η₅₈₆ = 0.61, and η₁₂₈₉ = 0.78 (see Fig. 4a and its in-text description for details)