Determining molecular orientation via single molecule SERS in a plasmonic nano-gap

Nanoscale
Addison R L MarshallAli M Adawi

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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Citations

Sep 12, 2018·Beilstein Journal of Nanotechnology·Janning F Herrmann, Christiane Höppener
Feb 4, 2021·The Journal of Physical Chemistry Letters·Abdullah O HamzaAli M Adawi
Jan 23, 2019·Accounts of Chemical Research·Diego P Dos SantosAlexandre G Brolo
Oct 20, 2018·ACS Nano·Chenyang GuoDong Xiang

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Methods Mentioned

BETA
Surface Enhanced Raman Scattering

Software Mentioned

Lumerical
Gaussian

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