Fiber-free coupling between bulk laser beams and on-chip polymer-based multimode waveguides |
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Authors: | Jensen Thomas G Nielsen Lars B Kutter Jörg P |
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Institution: | DTU Nanotech, Department of Micro and Nanotechnology, Technical University of Denmark (DTU), Lyngby, Denmark. |
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Abstract: | In this paper, we demonstrate the design of a virtually alignment-free optical setup for use with microfluidic applications involving a layered glass/SU-8/PDMS (polydimethylsiloxane) chip. We show how inexpensive external lenses combined with carefully designed on-chip lenses can be used to couple light from a bulk beam to on-chip waveguides and back into a bulk beam again. Using this setup, as much as 20% of the light coming from the source can be retrieved after passing through the on-chip waveguides. The proposed setup is based on a pin-aided alignment system that makes it possible to change chips in the optical train in only a few seconds with a standard deviation of about 2% in the transmitted power. Furthermore, we demonstrate how these optical setups can be combined with microfluidics to create an on-chip flow cytometer enabling detection and counting of polystyrene particles down to 1 μm at a rate of 100 Hz. |
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