Direct monitoring of plasmon resonances in a tip-surface gap of varying width

被引：115
作者：
Pettinger, Bruno
Domke, Katrin F.
Zhang, Dai
Schuster, Rolf
Ertl, Gerhard
机构：
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Univ Karlsruhe, Inst Phys Chem, D-76128 Karlsruhe, Germany
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 11期
关键词：
ENHANCED RAMAN-SPECTROSCOPY; LIGHT-EMISSION; SCATTERING; BIOCHEMISTRY; MODES; PROBE;
D O I：
10.1103/PhysRevB.76.113409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied the dependence of tip-enhanced Raman (TER) spectra composed of discrete Raman lines and an intense Lorentzian-shaped background on varying interparticle distance. For increasing tip-sample separation, we observe a remarkable blueshift of the background maximum that is ascribed to an energy shift of the localized surface plasmon resonance. In addition, we report on a steep background and Raman band intensity decrease within 5-10 nm tip retraction that highlights the underlying near-field enhancement mechanism of TER spectroscopy.
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页数：4
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