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Authors: F. Peyskens, P.C. Wuytens, A. Raza, P. Van Dorpe, R. Baets
Title: Waveguide excitation and collection of surface-enhanced Raman scattering from a single plasmonic antenna
Format: International Journal
Publication date: Accepted for publication. Not yet published
Journal/Conference/Book: Nanophotonics


The integration of plasmonic antennas on single-mode silicon-nitride waveguides
offers great perspective for integrated surface-enhanced Raman spectroscopy. However,
the few reported experimental demonstrations still require multiple plasmonic
antennas to obtain a detectable SERS spectrum. Here we show, for the first time,
SERS signal detection by a single nanoplasmonic antenna integrated on a single mode
SiN waveguide. For this purpose, we investigated a backscattering detection scheme
in combination with background noise reduction, which allowed an optimization of the
Signal-to-Noise Ratio (SNR) of this platform. Furthermore, a comparison with the
free space SERS spectrum of the same antenna shows that the conversion efficiency
from pump power to total radiated Stokes power is twice as efficient in the case of
waveguide excitation. As such, we explored several important aspects in the optimization
of on-chip SERS sensors and experimentally demonstrated the power of exciting
nanoplasmonic antennas using the evanescent field of a waveguide. This observation
is not only useful for Raman sensing but could be beneficial for any process involving
plasmonic enhancement.

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