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Vogt J, Huck C, Neubrech F, et al. Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals. Phys Chem Chem Phys. 2014;17(33):21169-75doi: 10.1039/c4cp04851b.
Vogt, J., Huck, C., Neubrech, F., Toma, A., Gerbert, D., & Pucci, A. (2015). Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals. Physical chemistry chemical physics : PCCP, 17(33), 21169-75. https://doi.org/10.1039/c4cp04851b
Vogt, Jochen, et al. "Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals." Physical chemistry chemical physics : PCCP vol. 17,33 (2015): 21169-75. doi: https://doi.org/10.1039/c4cp04851b
Vogt J, Huck C, Neubrech F, Toma A, Gerbert D, Pucci A. Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals. Phys Chem Chem Phys. 2015 Sep 07;17(33):21169-75. doi: 10.1039/c4cp04851b. Epub 2014 Dec 17. PMID: 25516198.
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Phys Chem Chem Phys. 2015 Sep 07;17(33):21169-75. doi: 10.1039/c4cp04851b. Epub 2014 Dec 17.

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

Physical chemistry chemical physics : PCCP

Jochen Vogt, Christian Huck, Frank Neubrech, Andrea Toma, David Gerbert, Annemarie Pucci

Affiliations

  1. Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany. [email protected].

PMID: 25516198 DOI: 10.1039/c4cp04851b

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.

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