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Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals

We report on the impact of the differing spectral near- and far-field properties of resonantly excited gold nanoantennas on the vibrational signal enhancement in surface-enhanced infrared absorption (SEIRA). The knowledge on both spectral characteristics is of considerable importance for the optimiz...

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Bibliographic Details
Main Authors: Vogt, Jochen (Author) , Huck, Christian (Author) , Neubrech, Frank (Author) , Toma, Andrea (Author) , Gerbert, David (Author) , Pucci, Annemarie (Author)
Format: Article (Journal)
Language:English
Published: 2015
In: Physical chemistry, chemical physics
Year: 2014, Volume: 17, Issue: 33, Pages: 21169-21175
ISSN:1463-9084
DOI:10.1039/C4CP04851B
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/C4CP04851B
Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp04851b
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Author Notes:Jochen Vogt, Christian Huck, Frank Neubrech, Andrea Toma, David Gerbert and Annemarie Pucci
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Summary:We report on the impact of the differing spectral near- and far-field properties of resonantly excited gold nanoantennas on the vibrational signal enhancement in surface-enhanced infrared absorption (SEIRA). The knowledge on both spectral characteristics is of considerable importance for the optimization of plasmonic nanostructures for surface-enhanced spectroscopy techniques. From infrared micro-spectroscopic measurements, we simultaneously obtain spectral information on the plasmonic far-field response and, via SEIRA spectroscopy of a test molecule, on the near-field enhancement. The molecular test layer of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) was deposited on the surface of gold nanoantennas with different lengths and thus different far-field resonance energies. We carefully studied the Fano-type vibrational lines in a broad spectral window, in particular, how the various vibrational signals are enhanced in relation to the ratio of the far-field plasmonic resonance and the molecular vibrational frequencies. As a detailed experimental proof of former simulation studies, we show the clearly red-shifted maximum SEIRA enhancement compared to the far-field resonance.
Item Description: First published 08 December 2014
Gesehen am 25.06.2020
Physical Description:Online Resource
ISSN:1463-9084
DOI:10.1039/C4CP04851B

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