Regensburg 2013 – wissenschaftliches Programm

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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

Dienstag, 12. März 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 Neubrech^1,2, 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.