Competition between excitation and emission enhancements of quantum dots on disordered plasmonic nanostructures

Seung Ho Choi, Bongseop Kwak, Bumsoo Han, Young L. Kim

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)16785-16793
Number of pages9
JournalOptics Express
Volume20
Issue number15
DOIs
StatePublished - Jul 16 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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