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 36.21: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B2
Surface-enhanced infrared spectroscopy of CBP-molecules based on nanometer-sized gaps — •Christian Huck1, Frank Neubrech1,2, Andrea Toma3, David Gerbert1, Thomas Härtling4, Enzo Di Fabrizio3, and Annemarie Pucci1 — 1Kirchhoff-Institute for Physics, Heidelberg University, Germany — 24th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 3Istituto Italiano di Tecnologia (IIT), Genova, Italy — 4Fraunhofer Institute for Non-Destructive Testing, Dresden, Germany
Infrared spectroscopy is well suited for label-free characterization of molecular species. One disadvantage of the IR-spectroscopy is the relative low IR cross-section of molecular vibrations. One possibility to overcome this limitation is the use of surface-enhanced IR spectroscopy (SEIRS), where metal nanoparticles are used to enhance the electromagnetic field in their vicinity. If the resonance frequency of such particles matches molecule-vibrations, the vibrational signal can be enhanced up to 5 orders of magnitude. Additional enhancement is theoretically predicted and can be achieved by exploiting the extraordinary field enhancement of two antennas interacting across a very small gap.
Individual nanoantenna dimers with gap sizes down to 4 nm were prepared by electron beam lithography and subsequent photochemical metal deposition. Afterwards the dimers were covered with a 5 nm layer of CBP acting as a near-field probe. Our experiments show an increasing vibrational signal enhancement for decreasing gap sizes demonstrating the additional enhancement induced by nanometer-sized gaps.