期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 33, 页码 21169-21175出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp04851b
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资金
- European project NANOANTENNA [HEALTH-F5-2009-241818]
- Heidelberg Graduate School of Fundamental Physics
- Helmholtz Graduate School for Hadron and Ion Research
- Baden-Wuerttemberg-Stiftung
- ERC (COMPLEXPLAS)
- Ministry for Education and Research
- Ministry for Science, Research and Arts Baden-Wuerttemberg
- BMBF MESOMERIE Project [FKZ 13N10724]
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 4,40-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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