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

Pettinger, Bruno; Domke, Katrin Friederike; Zhang, Dai; Schuster, Rolf; Ertl, Gerhard

doi:10.1103/PhysRevB.76.113409

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

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Pettinger, Bruno
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Domke, Katrin Friederike
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zhang, Dai
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl, Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Pettinger, B., Domke, K. F., Zhang, D., Schuster, R., & Ertl, G. (2007). Direct monitoring of plasmon resonances in a tip-surface gap of varying width. Physical Review B, 76(11): 113409. doi:10.1103/PhysRevB.76.113409.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-FFBD-4

Abstract

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.