Multiple surface plasmon resonances and near-infrared field enhancement of gold nanowells

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DOIResolve DOI: http://doi.org/10.1021/ac800149d
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TypeArticle
Journal titleAnalytical Chemistry
Volume80
Issue13
Pages49454950; # of pages: 6
AbstractArrays of Au nanowells (NWs) were fabricated by electronbeam lithography (EBL) and characterized by surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS). It is revealed that these Au NW arrays exhibit multiple SP resonances that can be tuned byadjusting the geometrical characteristics of the NWs. SERS activity of Au NWs was confirmed for a range of excitation wavelengths and a number of model compounds including rhodamine 6G (R6G), phthalazine, and single-stranded oligonucleotides. According to numerical simulations based on the discrete dipole approximation (DDA), SERS enhancement originates from high electromagnetic fields (hot spots) localized both inside and outside individual NWs. In addition, far-field intercoupling effects between NWs have been observed experimentally in arrays with subwavelength pitch sizes. We show that the SERS enhancement factors can also be tuned and optimized by adjusting the geometry of NWs.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute; NRC Institute for Microstructural Sciences
Peer reviewedYes
NRC number53681
NPARC number15854997
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Record identifier1cd10865-b317-448e-b4e4-a842f4d8d265
Record created2010-07-30
Record modified2016-05-09
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