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  • Title: The plasmonic engineering of metal nanoparticles for enhanced fluorescence and Raman scattering.
    Author: Cade NI, Ritman-Meer T, Kwaka K, Richards D.
    Journal: Nanotechnology; 2009 Jul 15; 20(28):285201. PubMed ID: 19546490.
    Abstract:
    We have investigated the effects of tuning the localized surface plasmon resonances (LSPRs) of silver nanoparticles on the fluorescence intensity, lifetime, and Raman signal from nearby fluorophores. The presence of a metallic structure can alter the optical properties of a molecule by increasing the excitation field, and by modifying radiative and nonradiative decay mechanisms. By careful choice of experimental parameters we have been able to decouple these effects. We observe a fourfold increase in fluorescence enhancement and an almost 30-fold increase in decay rate from arrays of Ag nanoparticles, when the LSPR is tuned to the emission wavelength of a locally situated fluorophore. This is consistent with a greatly increased efficiency for energy transfer from fluorophores to surface plasmons, resulting in a significant increase in quantum yield. Additionally, spatial mapping of the surface enhanced Raman scattering signal from a nanoparticle array reveals highly localized differences in the excitation field.
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