Dresden 2006 – scientific programme

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AKB: Biologische Physik

AKB 12: Soft-Matter Nanofluidic Devices

AKB 12.6: Talk

Tuesday, March 28, 2006, 15:30–15:45, ZEU 255

Heating effects in dual beam laser traps — •Susanne Ebert, Kort Travis, and Jochen Guck — Universität Leipzig, Department of Soft Matter Physics, Linnéstr. 5, 04103 Leipzig, Germany

Dual beam laser traps in a microfluidic environment are a very useful tool for noninvasive handling and manipulation of cells and similar objects. Due to the low energy density of the divergent trapping beams, heating effects are expected to be rather small but cannot be generally excluded.

We applied a fluorescence intensity ratio technique using rhodamineB and rhodamine110 to measure spatial temperature profiles in a microfluidic setup with a confocal laser scanning microscope. The data, taken for two different wavelengths (1064 nm and 780 nm), will be compared to theoretical models and to measurements taken with a thermosensitive camera.