Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Signe Damm, Stefano Fedele, Antony Murphy, Kristina Holsgrove, Miryam Arredondo-Arechavala, Robert Pollard, James N. Barry, Denis P. Dowling, James H. Rice*

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Here, we demonstrate that quasi self-standing Au nanorod arrays prepared with plasma polymerisation deposited SiO2 dielectric spacers support surface enhanced fluorescence (SEF) while maintaining high signal reproducibility. We show that it is possible to find a balance between enhanced radiative and non-radiative decay rates at which the fluorescent intensity is maximized. The SEF signal optimised with a 30 nm spacer layer thickness showed a 3.5-fold enhancement with a signal variance of <15% thereby keeping the integrity of the nanorod array. We also demonstrate the decreased importance of obtaining resonance conditions when localized surface plasmon resonance is positioned within the spectral region of Au interband transitions. Procedures for further increasing the SEF enhancement factor are also discussed.
Original languageEnglish
Article number183109
Number of pages5
JournalApplied Physics Letters
Volume106
Issue number18
Early online date06 May 2015
DOIs
Publication statusPublished - 2015

Keywords

  • SILVER-ISLAND FILMS
  • RAMAN-SCATTERING
  • SPONTANEOUS EMISSION
  • ENERGY-TRANSFER
  • QUANTUM DOTS
  • NANOPARTICLES
  • LUMINESCENCE
  • DEPENDENCE
  • SURFACES
  • DISTANCE

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