The Effect of an Active Substrate on Nanoparticle-Enhanced Fluorescence


  • This work supported by the IC Postdoctoral Program, the Laboratory for Physical Sciences, and in part by the NSF-MRSEC, DMR 0520471. The authors thank Microcosm, Inc. for assistance during the laser scanning microscopy measurements.


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Proximity of fluorescent molecules to noble metal nanoparticles leads to a strong enhancement of the fluorescent intensity during irradiation with light, a consequence of resonant coupling to localized particle plasmons. In this communication we show that the substrate can have a profound effect on this simple picture, not merely shifting the resonance, but actively reshaping the local fields, and resulting in even larger enhancements.