Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.73: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

Gold nanocones for Raman-based biosensing — •Christian Schäfer, Katharina Broch, Yuliya Fulmes, Dominik Gollmer, Frank Schreiber, Dieter Kern, and Monika Fleischer — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

Raman spectroscopy is a powerful tool for detection and analysis of biomolecules because it delivers a specific fingerprint of the tested molecule. In order to develop a highly sensitive biosensor the small cross section of Raman scattering has to be increased. This is usually done by rough metallic surfaces or nanoparticles and their strong plasmon induced near-field. We use gold nanocones, with sharp tips of less than 10 nanometers in diameter [1], for surface enhanced Raman spectroscopy (SERS). The nanocones, which are fabricated by e-beam lithography and Argon ion-milling, have a well-defined plasmon resonance frequency which can be tuned through the size of the cones. Therefore they can be optimized for the applied laser frequency. The Raman enhancement by the cones is demonstrated by the measurement of thin pentacene films on arrays of different-sized gold nanocones.

[1] M. Fleischer et al., Appl. Phys. Lett. 93, 111114 (2008)