Journal
PLASMONICS
Volume 8, Issue 2, Pages 225-231Publisher
SPRINGER
DOI: 10.1007/s11468-012-9379-8
Keywords
Plasmonic interaction; Surface-enhanced Raman scattering (SERS); Hot spot; Nanoscale gap
Funding
- National Basic Research Program (973 Program) of China [2012CB921900]
- National Natural Science Foundation of China [61036005, 11074241, 11004182]
- University of Utah MRSEC, NSF [DMR 1121252]
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A plasmonic coupling structure composed of Ag nanocap-nanohole pairs was fabricated through a novel and facile method. Both surface-enhanced Raman scattering (SERS) measurements and numerical simulations show that the cap-hole system produces much larger electric field enhancement and SERS signal than the isolated structures, which is due to the plasmonic coupling effect between the gap of the cap and the hole. Additionally, the plasmonic enhancement is sensitive to the gap size, which can be controlled by the Ag layer thickness during the evaporation process. A maximum enhancement factor of 1.1 x 10(8) can be obtained with optimized gap size.
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