Journal
NANOSCALE
Volume 9, Issue 44, Pages 17415-17421Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr05107g
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Funding
- University of Hull
- UK EPSRC [EP/L025078/1]
- European COST Action Nano-spectroscopy [MP1302]
- Spanish Ministerio de Economia y Competitividad [CTQ2014-58801, SEV-2015-0496]
- Campus of International Excellence (CEI) UAM + CSIC
- EPSRC [EP/L025078/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L025078/1] Funding Source: researchfish
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In this work, plasmonic nano-gaps consisting of a silver nanoparticle coupled to an extended silver film have been fully optimized for single molecule Surface-Enhanced Raman Scattering (SERS) spectroscopy. The SERS signal was found to be strongly dependent on the particle size and the molecule orientation with respect to the field inside the nano-gap. Using Finite Difference Time Domain (FDTD) simulations to complement the experimental measurements, the complex interplay between the excitation enhancement and the emission enhancement of the system as a function of particle size were highlighted. Additionally, in conjunction with Density Functional Theory (DFT), the well-defined field direction in the nano-gap enables to recover the orientation of individual molecules.
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