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Authors: F. Peyskens, P.C. Wuytens, A. Raza, VAN DORPE, Pol, R. Baets
Title: Waveguide excitation and collection of surface-enhanced Raman scattering from a single plasmonic antenna
Format: International Journal
Publication date: 5/2018
Journal/Conference/Book: Nanophotonics
Editor/Publisher: De Gruyter, 
Download: Download this Publication (1.1MB) (1.1MB)

Abstract


single-mode silicon nitride waveguides offers great
perspective for integrated surface-enhanced Raman
spectroscopy (SERS). However, the few reported experi-
mental 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 not only is useful for Raman sensing but also could be beneficial for any process involving plasmonic enhancement

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