Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Vibrational Spectroscopy of Nanolayers with Optical Probes
DS 36.4: Vortrag
Freitag, 29. Februar 2008, 11:30–11:45, H 2013
Resonance enhanced infrared spectroscopy using single gold nanowires — •Frank Neubrech1, Shafqat Karim2, Thomas Cornelius2, Javier Aizpurua3, and Annemarie Pucci1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Germany — 2Gesellschaft für Schwerionenforschung, Darmstadt, Germany — 3Donostia International Physics Center, Donostia-San Sebastian, Spain
We performed enhanced vibrational spectroscopy of molecules adsorbed on individual gold nanowires using synchrotron light of the ANKA IR-beamline at the Forschungszentrum Karlsruhe. Spectroscopic IR-microscopy of nanowires with a length of a few nanometer and a diameter of about 100nm prepared by electrochemical deposition in polymeric etched ion track membranes reveals antenna like plasmon resonances in the relative transmittance spectra. For a demonstration of resonance enhanced spectroscopy we used an octadecanethiol (ODT) monolayer as adsorbate. Depending on the spectral position of the antenna-like resonance in relation to the absorption bands of ODT (2850cm−1 and 2919cm−1) enhancement factors (enhanced absorption signal divided by not enhanced absorption signal) up to 300 000 can be achieved. Such high factors exceed the enhancement obtained by common surface enhanced infrared absorption techniques, e.g. rough films substrates, by at least 2 orders of magnitude.