Publication Type
Journal
Journal Name
Nano Letters
Publication Date
Page Numbers
4952 to 4955
Volume
10
Issue
4
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 two 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.
