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Simultaneous Surface-Enhanced Resonant Raman and Fluorescence Spectroscopy of Monolayer MoSe2: Determination of Ultrafast Decay Rates in Nanometer Dimension
journal contribution
posted on 2019-08-23, 21:14 authored by Yexin Zhang, Wen Chen, Tong Fu, Jiawei Sun, Daxiao Zhang, Yang Li, Shunping Zhang, Hongxing XuThe fact that metallic
nanostructures are an excellent light receiver
and transmitter connects the underlying principles of two widely applied
optical processes: surface-enhanced Raman scattering (SERS) and surface-enhanced
fluorescence (SEF). A comparative study of SERS and SEF can eliminate
the typical unknown quantities of the system and reveal important
parameters that cannot be accessed by conventional techniques. Here,
we use this simultaneous SERS and SEF technique in a monolayer MoSe2 coupled plasmonic nanocavity. After optimizing the spatial
and the spectral overlaps between excitonic and plasmonic resonances,
the SERS and SEF enhancement factors can exceed 107 and
6000, respectively, at the same time on the same nanocube. The comparison
of the SERS and SEF enhancements allows the estimation of the ultrafast
total decay rate of the bright exciton in monolayer MoSe2 in the nanocavity down to tens of femtoseconds, which is otherwise
hard to realize using time-resolved techniques.
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surface-enhanced Ramandecay rateSEF enhancementsMonolayer MoSe 2time-resolved techniquesSEF enhancement factorsSERSsurface-enhanced fluorescence10 7monolayer MoSe 2plasmonic resonancesUltrafast Decay RatesSEF techniqueplasmonic nanocavityFluorescence Spectroscopylight receiverNanometer DimensionSimultaneous Surface-Enhanced Resonant Raman
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