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MO: Molekülphysik

MO 59: Poster: Experimental Techniques

MO 59.1: Poster

Thursday, March 16, 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.