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Determining Molecular Orientation via Single Molecule SERS in a Plasmonic Nano-gap

Abstract

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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Publication details

The article was received on 13 Jul 2017, accepted on 02 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05107G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Determining Molecular Orientation via Single Molecule SERS in a Plasmonic Nano-gap

    A. R. L. Marshall, J. Stokes, F. N. Viscomi, J. E. Proctor, J. Gierschner, J. Bouillard and A. Adawi, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05107G

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