Fiber‐free coupling between bulk laser beams and on‐chip polymer‐based multimode waveguides

Thomas Glasdam Jensen, Lars Bue Nielsen, Jörg Peter Kutter

    Research output: Contribution to journalJournal articleResearchpeer-review


    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.
    Original languageEnglish
    Issue number10
    Pages (from-to)1224-1232
    Publication statusPublished - 2011


    • Waveguides
    • Lenses
    • Light coupling
    • Alignment‐free
    • Cytometry

    Fingerprint Dive into the research topics of 'Fiber‐free coupling between bulk laser beams and on‐chip polymer‐based multimode waveguides'. Together they form a unique fingerprint.

    Cite this