Fig. 5.

An image of a prototype of microfluidic flow cytometer, showing incoming and scattered light lines (in blue) as well as a large numerical aperture fluorescence collection line (in red). Each line has two integrated fluidic lenses that are, by fabrication, perfectly aligned to their respective waveguides and to the fluidic channel. The entire chip is very compact, measuring roughly 2 cm × 2 cm with the two-dimensional optical toolbox. Scattering detection (blue colored) and fluorescence detection (red colored) optics systems are integrated on a chip with a small form factor.