30 August 2006 Reduced second harmonic generation from closely spaced pairs of Au nanoparticles
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Closely spaced pairs or "dimers" of elongated gold nanoparticles may be expected to exhibit electric field hotspots. We investigate the possible influence of hotspots on second harmonic generation. Preliminary results show that arrays of nanoparticle dimers exhibit reduced second-harmonic generation compared with arrays of single nanoparticles having similar extinction spectra, contradicting a simple model of second-harmonic generation (varying as the fourth power of the local fundamental field) if hotspots can be shown to exist in such gaps.
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Matthew D. McMahon, Matthew D. McMahon, Davon Ferrara, Davon Ferrara, Rene Lopez, Rene Lopez, Richard F. Haglund, Richard F. Haglund, "Reduced second harmonic generation from closely spaced pairs of Au nanoparticles", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 63230U (30 August 2006); doi: 10.1117/12.683075; https://doi.org/10.1117/12.683075

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