Comparison of robust coupling techniques for planar waveguide immunosensors

Douglas A. Christensen; Shellee Dyer; James N. Herron; Vladimir Hlady

doi:10.1117/12.143532

30 April 1993 Comparison of robust coupling techniques for planar waveguide immunosensors

Douglas A. Christensen, Shellee Dyer, James N. Herron, Vladimir Hlady

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143532
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

We have analyzed and fabricated two different coupling schemes to meet the requirements for a convenient means of coupling into a planar waveguide immunosensor that is relatively insensitive to beam alignment. These are the `launch' coupler and the grating coupler. Each possesses advantages and disadvantages, depending mainly on the thickness (mode number) of the waveguide to be illuminated. For example, the launch coupler is best suited to a thick (highly multimode) waveguide and is less efficient for a thin (few mode) guide. Our experimental results verify predictions of a ray theory developed to give coupling efficiency for a variety of coupling parameters.

Citation Download Citation

Douglas A. Christensen, Shellee Dyer, James N. Herron, and Vladimir Hlady "Comparison of robust coupling techniques for planar waveguide immunosensors", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143532

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