Anna Bergmann

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In recent years, optical manipulation has been emerging as a powerful technique in a wide range of applications, especially in the field of biological sciences. It is a mechanism to handle micrometer sized particles without mechanical or thermal damage or contamination. Lately, the use of VCSELs (vertical-cavity surface-emitting lasers) as light sources in(More)
The combination of microfluidics and optical manipulation offers new possibilities for particle handling in the field of biophotonics. VCSELs with small dimensions and low power consumption allow such a combination at potentially low cost. The circular laser output beam is shaped by an etched surface relief and an integrated photoresist microlens. Thus the(More)
We present the concept of an ultra-small, potentially low-cost microfluidic sorting unit based on vertical-cavity surface-emitting lasers. The densely packed lasers are integrated with the microfluidic channel and form an optical lattice. We show first results in an experimental setup, followed by tests of the first generation of integrated setups. A(More)
Total bootstrap current calculations with the updated VENUS+δf code that incorporates energy convolution and the momentum correction technique have been performed for the reference tokamak JT-60U cases and for the experimental Large Helical Device (LHD, NIFS, Japan) configurations with different magnetic axis positions. The VENUS+δf results have been(More)
Optical manipulation of cells and particles is an efficient non-destructive technique for isolation and sorting in the field of biophotonics. For several years, vertical-cavity surfaceemitting lasers (VCSELs) have been investigated as light sources for particle manipulation inside microfluidic channels, where their small dimension and low power consumption(More)
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