Berlin 2005 – scientific programme

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AKB: Biologische Physik

AKB 200: Poster Session II

AKB 200.6: Poster

Tuesday, March 8, 2005, 17:00–19:00, Poster TU C

Biofilms of phototrophic systems in the evanescent field of light guides — •Davor Kosanic, Sven Schlicher, Sven Verpoort, Diana Fragel, and Hilmar Franke — Physics department, university of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

The interaction of biological systems with light has to be investigated for optical biosensors and for bioreactors. Especially when working with optical light guides the interaction takes place via the evanescent field. Therefore the particular field distributions have to be known.

The growth of algae on optical fiber tips or optical sensors has been investigated by video microscopy and by plasmon-leaky mode spectroscopy. For the latter method suspension of green algae in water has been regarded as an optical medium with high absorption coefficients. Model experiments have been performed using rhodamine/ethanol solutions.

The conventional plasmon-leaky mode set-up has been modified towards a compact method for monitoring solutions and suspensions with high absorption coefficients in the range of 50000 1/m , realistic values in algae suspensions.