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...
Gespeichert in:
| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2015
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| In: |
Physical chemistry, chemical physics
Year: 2014, Jahrgang: 17, Heft: 33, Pages: 21169-21175 |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/C4CP04851B |
| Online-Zugang: | 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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| Verfasserangaben: | Jochen Vogt, Christian Huck, Frank Neubrech, Andrea Toma, David Gerbert and Annemarie Pucci |
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| 245 | 1 | 0 | |a Impact of the plasmonic near- and far-field resonance-energy shift on the enhancement of infrared vibrational signals |c Jochen Vogt, Christian Huck, Frank Neubrech, Andrea Toma, David Gerbert and Annemarie Pucci |
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| 520 | |a 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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