Abstract
A new strategy named integrated plasmon-enhanced Raman scattering (iPERS) spectroscopy that features a configuration of evanescent field excitation and inverted collection is presented, which well unites the local field enhancement and far field emission, couples localized and propagating surface plasmons, integrates the SERS substrates and Raman spectrometers via a self-designed aplanatic solid immersion lens. A metallic nanoparticle-on-a film (NOF) system was adopted in this configuration because it improves the amplification of the incidence light field in near field by 10 orders of magnitude due to the simultaneous excitation of quadrupolar and dipolar resonance modes. This iPERS allows for higher excitation efficiency to probed molecules and full collection of the directional-radiation Raman scattering signal in an inverted way, which exhibits a practical possibility to monitor plasmonic photocatalytic reactions in nanoscale and a bright future on interfacial reaction studies.
Highlights
Resonating the surface plasmon wave with the incident light vector plays a decisive role in all plasmon-based spectroscopies and sensing, e.g. metal-enhanced fluorescence and SERS
The coupling the localized surface plasmons (LSPs) in near field, and (2) the SERS emission in far field
The LSPs excite the Raman scattering of the probed molecules in the nanogap, and the scattering light couples the propagating surface plasmons (PSPs) of the Ag film again
Summary
Resonating the surface plasmon wave with the incident light vector plays a decisive role in all plasmon-based spectroscopies and sensing, e.g. metal-enhanced fluorescence and SERS. A unique way that improves the SERS excitation and emission is presented by developing an integrated plasmon-enhanced Raman scattering (iPERS) spectrometer using a specially designed aplanatic solid immersion lens (ASIL, NA ≈ 1.65).
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