Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 59: Poster: Experimental Techniques
MO 59.1: Poster
Donnerstag, 16. März 2006, 16:30–18:30, Labsaal
Ultrathin optical fiber absorption spectroscopy of sub-monolayers at ambient conditions — •Florian Warken1, E. Vetsch1, G. Sagué1, D. Haubrich1, D. Meschede1, M. Sokolowski2, and A. Rauschenbeutel1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn — 2Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn
Ultrathin tapered optical fibers provide strong evanescent fields over almost unlimited length. Such fibers promise to even detect very few molecules or single atoms. In our experiment we demonstrate an extremely sensitive, simple and fast method for absorption spectroscopy of different organic molecules adsorbed at the surface of a fiber at ambient conditions. Furthermore, we are able to resolve the dynamics of agglomerating molecules while undergoing phase transition from gas to adsorbate. This results in a shift and broadening of the absorption spectrum. We discuss the potential for detection of single molecules. Furthermore the investigation of spectra in the strong coupling regime with a micro-cavity such as bottle or Fabry-Perot resonator is considered.
Financial support by the DFG research unit 557 is gratefully acknowledged.