Tip-enhanced Raman scattering: Influence of the tip-surface geometry on optical resonance and enhancement |
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| Authors: | Bruno Pettinger Katrin F. Domke Dai Zhang Gennaro Picardi Rolf Schuster |
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| Affiliation: | 1. Physikalische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany;2. Biosurface Spectroscopy, FOM AMOLF, Kruislaan 407, NL-1098 SJ, Amsterdam;3. Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, D-72076 Tübingen, Germany;4. LPICM - Batiment 406, Ecole Polytechnique, 91128 Palaiseau, Cedex, France;5. Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstr. 12, D-76131 Karlsruhe, Germany;1. Bonn, Germany;2. Seattle, USA |
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| Abstract: | The tip-sample distance (z) dependence of tip-enhanced Raman scattering (TERS) has been investigated. The intensities of both, the Raman lines and the broad TERS background, exhibit strong decays with increasing z, which are nearly complete within 10 nm withdrawal of the STM tip in z direction. Interestingly, the maximum of the broad Lorentzian-shaped TER background is substantially blue shifted in energy with z. This effect is ascribed to a corresponding blue shift of the energies of localized plasmon modes upon tip retraction. Both experimental results fit very well data of a simple theoretical near-field model. |
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