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. Author manuscript; available in PMC: 2013 Jun 13.
Published in final edited form as: Nano Lett. 2012 May 21;12(6):3231–3237. doi: 10.1021/nl3012227

Figure 4. The resonance wavelength (λ) depends on the level of NP clustering for a given NP density (ρ).

Figure 4

Typical spatial distributions of 40nm Au NPs in a) random, b) 50% dimers, c) 50% trimers, and d) 50% clustered NP assemblies with varying particle density. e) Peak resonance wavelengths of the ensemble-averaged scattering spectra of the NP assemblies shown in (a–d) as a function of NP density.