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Experimental set up for fiber integrated microfluidic switching system. The inset includes illustration of optical switching with fiber where the cylindrical microlens was used to deflect laser beam for different bias angle . The arrow indicates the particle flow direction. The objective lens was used for imaging and optical fiber alignment.
[(a)–(c)] Consecutive images of PS spheres with a diameter of passing through the intersection. (a) Two spheres initially flowing in the channel at . The latter one (2) was targeted to be switched. [(b)–(c)] Laser turned on after the first sphere (1) passed by. The second sphere (2) was propelled into the collection outlet by optical force. The first sphere (1) passed straight through. [(d)–(e)] Trajectories of the particles in two different fiber orientations. Laser (100 mW) beam paths are indicated by the dotted lines. The particles were moving at an average speed of in both experiments. The white arrows show the direction of fluid flow (enhanced online). [URL: http://dx.doi.org/10.1063/1.3512902.1]10.1063/1.3512902.1
(a) The -wide channel was equally divided into five zones, labeled 1 to 5. The figure also depicts the beam path of the laser when the illumination light was turned off. (b) Switching percentage of PS spheres with a diameter of vs the velocity of the spheres for different zones. Laser power is 100 mW.
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