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Issue 33, 2015
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Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals

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Abstract

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.

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

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Publication details

The article was received on 23 Oct 2014, accepted on 08 Dec 2014 and first published on 08 Dec 2014


Article type: Paper
DOI: 10.1039/C4CP04851B
Citation: Phys. Chem. Chem. Phys., 2015,17, 21169-21175
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    Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals

    J. Vogt, C. Huck, F. Neubrech, A. Toma, D. Gerbert and A. Pucci, Phys. Chem. Chem. Phys., 2015, 17, 21169
    DOI: 10.1039/C4CP04851B

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