A Long-Range Surface Plasmon
Resonance/Probe/Silver
Nanoparticle (LRSPR-P-NP) Nanoantenna Configuration for Surface-Enhanced
Raman Scattering
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Abstract
The purpose of this paper is to enhance Raman signals
with a plasmonic
nanoantenna based on a long-range surface plasmon resonance/probe/silver
nanoparticle (LRSPR-P-NP) sandwich configuration. The finite-difference
time-domain simulation shows that the electromagnetic field at the
gap between the silver film and a silver nanoparticle increases by
a factor of about 2.1 × 10<sup>4</sup>. The resonance condition
of this plasmonic nanoantenna was optimized by incident angle-dependent
surface-enhanced Raman scattering (SERS) spectroscopy under an evanescent
field excitation mode. The SERS signal obtained under the LRSPR-P-NP
configuration at the LRSPR angle was 40 times higher than that collected
on the planar film plasmonic nanoantenna. The enhancement factor of
the LRSPR-P-NP configuration was 9.2 × 10<sup>8</sup>. This plasmonic
nanoantenna was also applied for pH sensing