Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)
O 34.50: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster E
Fabrication of nanometer-sized gaps between nanoantenna dimers by photo-chemical metal deposition for SEIRS measurements — •Christian Huck1, Daniel Weber1, Frank Neubrech1, Julia Katzmann2, Thomas Härtling2, Andrea Toma3, Enzo Di Fabrizio3, and Annemarie Pucci1 — 1Kirchhoff-Institute for Physics, Im Neuenheimer Feld 227, Heidelberg, Germany — 2Fraunhofer Institute for Non-Destructive Testing, Dresden, Germany — 3Istituto Italiano di Tecnologia (IIT), Genova, Italy
Metal nanoparticles exhibit surface plasmons, which are able to strongly enhance electromagnetic fields when excited by electromagnetic radiation. If the resonance frequency matches specific IR active vibrations of molecules, the detection of such vibrations of molecules adsorbed on the antennas can be improved up to 5 orders of magnitude. Additional enhancement can be achieved by exploiting the extraordinary field enhancement of two antennas interacting across a very small gap. Constraints in the lithographic fabrication limit the gap size to ≥ 20nm.
To overcome these limitations, we applied the method of optically induced metal deposition to lithographically prepared gold nanoantennas. The technique was demonstrated for nm-sized structures and is applied here in the µm range.Covering the nanorods on the substrate with a solution of HAuCl4 and illuminating them by a focused 532nm laser beam leads to the reduction of the gold salt and to a gradual growth of the nanorods. The changes of the optical particle properties can be monitored by IR-spectroscopy.