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Title: Differential Wavevector Distribution of Surface-Enhanced Raman Scattering and Fluorescence in a Film-Coupled Plasmonic Nanowire Cavity

Journal Article · · Nano Letters
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  1. Indian Inst. of Science Education and Research (IISER), Pune (India). Photonics and Optical Nanoscopy Lab. and Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  3. Indian Inst. of Science Education and Research (IISER), Pune (India). Center for Energy Science, Photonics and Optical Nanoscopy Lab. and Dept. of Physics

Here, we report on the experimental observation of differential wavevector distribution of surface-enhanced Raman scattering (SERS) and fluorescence from dye molecules confined to a gap between plasmonic silver nanowire and a thin, gold mirror. The fluorescence was mainly confined to higher values of in-plane wavevectors, whereas SERS signal was uniformly distributed along all the wavevectors. The optical energy momentum spectra from the distal end of the nanowire revealed strong polarization dependence of this differentiation. All these observations were corroborated by full-wave three-dimensional numerical simulations, which further revealed an interesting connection between out-coupled wavevectors and parameters such as hybridized modes in the gap-plasmon cavity, and orientation and location of molecular dipoles in the geometry. Our results reveal a new prospect of discriminating electronic and vibrational transitions in resonant dye molecules using a subwavelength gap plasmonic cavity in the continuous-wave excitation limit, and can be further harnessed to engineer molecular radiative relaxation processes in momentum space.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Dept. of Science and Technology (India); Indo-U.S. Science and Technology Forum (IUSSTF)
Grant/Contract Number:
AC02-06CH11357; SR/NM/NS-1141/2012; SR/NM/TP-13/2016
OSTI ID:
1461299
Journal Information:
Nano Letters, Vol. 18, Issue 1; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (8)

Tunable single-mode lasing in a single semiconductor microrod journal January 2018
Vectorial Fluorescence Emission from Microsphere Coupled to Gold Mirror journal September 2018
Momentum‐Resolved Surface Enhanced Raman Scattering from a Nanowire–Nanoparticle Junction Cavity journal May 2019
Mitigating Chromatic Dispersion with Hybrid Optical Metasurfaces journal September 2018
Remote excitation and detection of surface-enhanced Raman scattering from graphene journal January 2018
Polarization-dependent surface plasmon-driven catalytic reaction on a single nanowire monitored by SERS journal January 2018
Vectorial Fluorescence Emission from Microsphere Coupled to Gold Mirror text January 2019
Momentum-resolved surface enhanced Raman scattering from a nanowire-nanoparticle junction cavity text January 2020