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Proceedings Paper

Step-etched prism coupling for optical waveguide biosensors
Author(s): Yan Zhou; Yee Loy Lam; Shi De Cheng; Chan Hin Kam
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Paper Abstract

We report a light input coupling method into a buried planar waveguide that is very promising for applications in disposable optical waveguide biosensors. The superstrate of the waveguide is step-etched and a prism made from polystyrene is permanently bonded onto the etched step using optical glue. The plastic prism and the waveguide form a `plug-in' assembly of the disposable part of a biosensor system. For light input coupling, no other pressure sensitive contact of optical components is required and a laser beam simply needs to be directed at the right position. Our experimental results show that the coupling has a highly reproducible efficiency of more than 20% and the coupling efficiency is reasonably tolerant of misalignment. Since the waveguide is fabricated using the ion-exchange process and the prism can be made using injection molding, we believe that our method is very suitable for planar-waveguide-based disposable biosensors.

Paper Details

Date Published: 4 December 1998
PDF: 4 pages
Proc. SPIE 3491, 1998 International Conference on Applications of Photonic Technology III: Closing the Gap between Theory, Development, and Applications, (4 December 1998); doi: 10.1117/12.328701
Show Author Affiliations
Yan Zhou, Nanyang Technological Univ. (Singapore)
Yee Loy Lam, Nanyang Technological Univ. (Singapore)
Shi De Cheng, Nanyang Technological Univ. (Singapore)
Chan Hin Kam, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 3491:
1998 International Conference on Applications of Photonic Technology III: Closing the Gap between Theory, Development, and Applications
George A. Lampropoulos; Roger A. Lessard, Editor(s)

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