Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)
O 15.60: Poster
Freitag, 4. März 2005, 17:00–20:00, Poster TU D
An approach on near-field Raman spectroscopy using the tetrahedral SNOM tip — •Stefan Klein1, Ulrich Fischer1, Daniel Molenda1, Harald Fuchs1, and Michael Hietschold2 — 1Physikalisches Institut, Westfälische-Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster — 2Institut für Physik, TU Chemnitz, D-09107 Chemnitz
The effect of field enhancement at nanoscale metallic structures is critical to optical phenomena such as surface-enhanced Raman scattering (SERS). Assemblies of coupled metal nanoparticles attracted high interest as SERS active systems supporting so called hot-spots of the electric field. Most recently tip-enhanced Raman scattering (TERS), where a metallic tip is situated near a smooth surface covered by Raman active species has been reported. The experimental results show, that only a small amount of molecules in the near-field of the laser irradiated tip-apex contributes to an observed characteristic Raman spectrum. The tip acts in these experiments similar to a single particle supporting a single hot-spot, which enhances the incident electric field. Different experimental approaches on TERS have been realized using metal coated AFM cantilevers or STM tips. Here we present an approach on near-field Raman spectroscopy using the tetrahedral SNOM tip to investigate molecular monolayers on gold films.