Evaluation of an ion-exchanged integrated optic waveguide for solution-phase chemical sensing

Kevin J. Kuhn; Lloyd W. Burgess

doi:10.1117/12.143544

30 April 1993 Evaluation of an ion-exchanged integrated optic waveguide for solution-phase chemical sensing

Kevin J. Kuhn, Lloyd W. Burgess

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143544
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

Borosilicate glass substrates with etched surface gratings were fabricated via a photolithographic patterning and hydrofluoric etch procedure. Ion-exchanged waveguides supporting multiple modes were produced by exposing etched grating substrates to silver nitrate melt at elevated temperature. Coupling a collimated laser beam to an ion-exchanged waveguide via an etched surface grating results in population of all allowed waveguide modes. Each mode is angularly resolved at the output grating and is imaged with a photodiode array detector. The large electric field density associated with total internal reflection at the glass/solution interface results in extreme sensitivity of the waveguide modes to interfacial phenomenon. In addition, the individual modes are expected to exhibit differential sensitivities to interfacial perturbations due to differences in electric field strength. The described ion- exchanged waveguide evaluation system captures the response of all waveguide modes simultaneously to changes in the chemical composition of the solution phase. Multivariate statistical methods are used to characterize the complicated multi-mode waveguide response.

Citation Download Citation

Kevin J. Kuhn and Lloyd W. Burgess "Evaluation of an ion-exchanged integrated optic waveguide for solution-phase chemical sensing", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143544

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