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Q: Fachverband Quantenoptik und Photonik

Q 58: Photonik II

Q 58.6: Vortrag

Donnerstag, 22. März 2007, 15:15–15:30, 5J

Selectively infiltrated hollow core photonic crystal fibers for fluorescence sensing — •Stephan Smolka, Michael Barth, and Oliver Benson — Nano Optics, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin

We investigate the potential of hollow core photonic crystal fibers (HCPCFs) for ultra-sensitive fluorescence detection in the visible. For this purpose the central hole of a HCPCF is selectively infiltrated with fluorophores using a fusion splicer technique. Depending on the infiltration procedure, the central hole is either coated with fluorophores or completely filled with dye-doped fluids, which allows us to study the sensing properties of HCPCFs operating in the band gap guiding regime and in the index guiding regime, respectively. The influence of reabsorption and intermolecular interactions are determined experimentally for both cases. We demonstrate that both configurations are suitable to detect dyes with concentrations down to 100 pM using only nanoliter sample volumes.

Our results show that depending on the employed coating/filling technique, HCPCFs can thus be applied for various sensing tasks. Coated fibers may be used in gas sensing devices where the fluorescence signal is affected by the concentration of several gases. By functionalization of the core walls and infiltration of biochemical samples, various chemical or biological processes might be monitored. Due to the small sample volumes an integration in optoelectronic devices could be managed.