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Proceedings Paper

Experimental correlation of electric fields and Raman signals in SERS and TERS
Author(s): Zachary D. Schultz; Hao Wang; Daniel T. Kwasnieski; James M. Marr
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Paper Abstract

Enhanced Raman scattering from plasmonic nanostructures associated with surface enhanced (SERS) and tip enhanced (TERS) is seeing a dramatic increase in applications from bioimaging to chemical catalysis. The importance of gapmodes for high sensitivity indicates plasmon coupling between nanostructures plays an important role. However, the observed Raman scattering can change with different geometric arrangements of nanoparticles, excitation wavelengths, and chemical environments; suggesting differences in the local electric field. Our results indicate that molecules adsorbed to the nanostructures are selectively enhanced in the presence of competing molecules. This selective enhancement arises from controlled interactions between nanostructures, such as an isolated nanoparticle and a TERS tip. Complementary experiments suggest that shifts in the vibrational frequency of reporter molecules can be correlated to the electric field. Here we present a strategy that utilizes the controlled formation of coupled plasmonic structures to experimentally measure both the magnitude of the electric fields and the observed Raman scattering.

Paper Details

Date Published: 26 August 2015
PDF: 8 pages
Proc. SPIE 9554, Nanoimaging and Nanospectroscopy III, 955409 (26 August 2015); doi: 10.1117/12.2189674
Show Author Affiliations
Zachary D. Schultz, Univ. of Notre Dame (United States)
Hao Wang, Univ. of Notre Dame (United States)
Daniel T. Kwasnieski, Univ. of Notre Dame (United States)
James M. Marr, Univ. of Notre Dame (United States)

Published in SPIE Proceedings Vol. 9554:
Nanoimaging and Nanospectroscopy III
Prabhat Verma; Alexander Egner, Editor(s)

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