Journal
NANO LETTERS
Volume 10, Issue 12, Pages 4952-4955Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102963g
Keywords
Electron beam lithography; FDTD simulation; optical nanoantenna; single molecule SERS; collective photonic effect
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Funding
- U S Department of Defense
- Materials Sciences and Engineering Division Office of Basic Energy Sciences U S Department of Energy (DOE)
- National Science Council of Taiwan
- DOE Scientific User Facilities Division
- LLC [DE-AC05-00OR22725]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906025] Funding Source: National Science Foundation
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We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements Surface enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna In addition to the well known gap size dependence up to 2 orders of magnitude additional enhancement is observed with elevated bowties The overall behavior is described by a SERS enhancement factor exceeding 10(11) along with an anomalously weak power law dependence of E on the gap slze in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime
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