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We present a microfluidic chip in Polymethyl methacrylate ( PMMA) for optical trapping of particles in an 80 mu m wide microchannel using two counterpropagating single-mode beams. The trapping fibers are separated from the sample fluid by 70 mu m thick polymer walls. We calculate the optical forces that act on particles flowing in the microchannel using wave optics in combination with non-sequential ray-tracing and further mathematical processing. We use a novel fabrication process that consists of a premilling step and ultraprecision diamond tooling for the manufacturing of the molds and double-sided hot embossing for replication, resulting in a robust microfluidic chip for optical trapping. In a proof-of-concept demonstration, we show the trapping capabilities of the hot embossed chip by trapping spherical beads with a diameter of 6 mu m, 8 mu m and 10 mu m and use the power spectrum analysis of the trapped particle displacements to characterize the trap strength.
|Article number||UNSP 98880B|
|Pages (from-to)||988801-01 - 988801-08|
|Number of pages||8|
|Journal||Proceedings of SPIE|
|Publication status||Published - 2016|
|Event||SPIE Micro-Optics 2016 - SQUARE Brussels Meeting Centre, Brussels, Belgium|
Duration: 4 Apr 2016 → 5 Apr 2016
- diamond machining
- microstructure fabrication
- micro-optical devices
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