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Title: Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO{sub 2} spacer layers

Here, we demonstrate that quasi self-standing Au nanorod arrays prepared with plasma polymerisation deposited SiO{sub 2} 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.
Authors:
; ;  [1] ; ; ; ;  [2] ; ;  [3]
  1. NanoPhotonics Research Group, University College Dublin, Belfield, Dublin 4 (Ireland)
  2. Centre for Nanostructured Media, The Queen's University of Belfast, Belfast BT7 1NN (United Kingdom)
  3. School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4 (Ireland)
Publication Date:
OSTI Identifier:
22399017
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; ENERGY-LEVEL TRANSITIONS; FLUORESCENCE; GOLD; LAYERS; PLASMA; PLASMONS; POLYMERIZATION; RESONANCE; SILICON OXIDES; SPACERS; SURFACES