Optofluidic microscope with 3D spatial resolution

Asger Laurburg Vig, Rodolphe Marie, Eric Jensen, Anders Kristensen
2010 Optics Express  
This paper reports on-chip based optical detection with threedimensional spatial resolution by integration of an optofluidic microscope (OFM) in a microfluidic pinched flow fractionation (PFF) separation device. This setup also enables on-chip particle image velocimetry (PIV). The position in the plane perpendicular to the flow direction and the velocity along the flow direction of separated fluorescent labeled polystyrene microspheres with diameters of 1 μm, 2.1 μm, 3 μm and 4 μm is determined
more » ... 4 μm is determined by the OFM. These results are bench marked against those obtained with a PFF device using conventional fluorescence microscope readout. The size separated microspheres are detected by OFM with an accuracy of ≤0.92μm. The position in the height of the channel and the velocity of the separated microspheres are detected with an accuracy of 1.4 μm and 0.08 mm/s respectively. Throughout the measurements of the height and velocity distribution, the microspheres are observed to move towards the center of the channel in regard to its height.
doi:10.1364/oe.18.004158 pmid:20389429 fatcat:uuifpvko4vacdgl3dx4rhgu25e