Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 57: Plasmonics and Nanooptics II

O 57.6: Talk

Wednesday, April 2, 2014, 17:15–17:30, GER 38

Gold nanocone arrays as effective SERS substrates — •Julia Fulmes, Christian Schäfer, Falk Anger, Dominik A. Gollmer, Andreas Horrer, Frank Schreiber, Dieter P. Kern, and Monika Fleischer — Institute for Applied Physics, University of Tübingen, Tübingen, Germany

Raman spectroscopy is a well-known technique for the detection and characterization of molecules. Spontaneous Raman scattering is typically very weak, but can be increased by many orders of magnitude by using surface enhanced Raman spectroscopy (SERS). We exploit arrays of plasmonic gold nanostructures (cones) with sharp tips of less than 10 nm in diameter [1] over large areas [2] for SERS. Due to the conical shape a strongly localized and enhanced electromagnetic field can be excited close to the cone apex. This allows for employing gold nanocone arrays for the detection of molecules with high sensitivity [3]. The successful application of gold nanocone arrays as SERS substrates for the analysis of different types of molecules, such as pentacene, 4-mercaptobenzoic acid and rubrene will be shown. By purposefully positioning molecules only on defined parts of the plasmonic nanostructures the Raman signal enhancement activity is investigated.

[1] M. Fleischer et al., Nanotechnology 21, 065301 (2010); [2] A. Horrer et al., Small, doi: 10.1002/smll.201300449 (2013); [3] J. Fulmes et al., in preparation.