Abstract
Plasmon-enhanced fluorescence is attributable to two independent processes: 1) excitation enhancement due to an increased electric field near metallic nanostructures and 2) emission enhancement from a surface plasmon resonance-coupled excited state of fluorophores. Using semiconductor nanocrystals (quantum dots) on disordered plasmonic nanostructures and a mesoscopic imaging approach, we demonstrate that increased excitation can diminish the fluorescence emission enhancement efficiency. Thus, our experimental evidence on this competitive behavior has critical implications for better developing plasmon-enhanced photoluminescence.
Original language | English (US) |
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Pages (from-to) | 16785-16793 |
Number of pages | 9 |
Journal | Optics Express |
Volume | 20 |
Issue number | 15 |
DOIs | |
State | Published - Jul 16 2012 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics