Free-Standing Optical Gold Bowtie Nanoantenna with Variable Gap Size for Enhanced Raman Spectroscopy
Nahla A. Hatab, Chun‐Hway Hsueh(Division of Materials Science and Engineering), A. L. Gaddis(Division of Materials Science and Engineering), Scott T. Retterer(Center for Nanophase Materials Sciences), Jia‐Han Li, Gyula Eres(Division of Materials Science and Engineering), Zhenyu Zhang(Division of Materials Science and Engineering), Baohua Gu
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Abstract
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 size 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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