Surface Plasmon-Coupled Directional Enhanced Raman Scattering by Means of the Reverse Kretschmann Configuration.
Surface-enhanced Raman scattering (SERS) is a unique analytical technique that provides fingerprint spectra, yet facing the obstacle of low collection efficiency. In this study, we demonstrated a simple approach to measure surface plasmon-coupled directional enhanced Raman scattering by means of the reverse Kretschmann configuration (RK-SPCR). Highly directional and p-polarized Raman scattering of 4-aminothiophenol (4-ATP) was observed on a nanoparticle-on-film substrate at 46° through the prism coupler with a sharp angle distribution (full width at half-maximum of ∼3.3°). Because of the improved collection efficiency, the Raman scattering signal was enhanced 30-fold over the conventional SERS mode; this was consistent with finite-difference time-domain simulations. The effect of nanoparticles on the coupling efficiency of propagated surface plasmons was investigated. Possessing straightforward implementation and directional enhancement of Raman scattering, RK-SPCR is anticipated to simplify SERS instruments and to be broadly applicable to biochemical assays.
Si-Xin
SX
Huo
Qian
Q
Liu
Shuo-Hui
SH
Cao
Wei-Peng
WP
Cai
Ling-Yan
LY
Meng
Kai-Xin
KX
Xie
Yan-Yun
YY
Zhai
∥State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China.
Cheng
C
Zong
Zhi-Lin
ZL
Yang
∥State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, China.
Bin
B
Ren
Yao-Qun
YQ
Li
directional Raman scattering; polarization; reverse Kretschmann; silver nanoparticle; surface plasmon-coupled emission