Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.37: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B2
Selective photo-induced metal deposition for fabrication of nanometer-sized gaps between infrared nanoantenna dimers — •Jochen Vogt1, Frank Neubrech1,2, Julia Katzmann3, Thomas Härtling3, Andrea Toma4, Enzo Di Fabrizio4, and Annemarie Pucci1 — 1Kirchhoff-Institute for Physics, Im Neuenheimer Feld 227, Heidelberg, Germany — 24th Physics Institute and Research Center SCoPE, University of Stuttgart, Stuttgart, Germany — 3Fraunhofer Institute for Non-Destructive Testing, Dresden, Germany — 4Istituto Italiano di Tecnologia (IIT), Genova, Italy
Excited metallic nanostructures separated by gaps in the nanometer range exhibit high confinement of electromagnetic fields. Resonant in the infrared, they are well suited for Surface-Enhanced Infrared Spectroscopy (SEIRS) of adsorbed molecules. In the standard electron beam lithographic fabrication process, limitations due to secondary electron effects cause the gap sizes of the initial dimers to be not smaller than approximately 10nm. In our approach, we apply the method of photo-chemical metal deposition in order to achieve further gap narrowing. The gold dimers on the substrate are covered with a gold salt solution and exposed to a focused laser beam. In our sample design, unwanted lateral growth of the dimer arms is prevented by an organic film covering the dimers in such an alignment, that spatially selective photo-chemical growth is enabled. After the growth procedure, the shielding film was removed and IR spectroscopy to determine optical properties of the dimers as well as SEIRS measurements of organic molecules were performed.