Fig. 5.

Dependence of coupling on nanoparticle-molecule separation. a Photoabsorption spectra for two benzene molecules coupled to the Al₂₀₁ particle, showing weaker splitting with increasing separation from 3–8 Å. b Coupling strength for two benzene molecules as a function of distance from the Al₂₀₁ particle, showing the expected decrease due to the decreasing overlap integral between exciton and mode