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Proceedings Paper

Inhomogeneous waveguiding structures for optical sensors
Author(s): Sonja Draxler; Max E. Lippitsch
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Paper Abstract

Combining a transparent substrate and a transparent sensing layer of rather similar refractive index into a common waveguiding structure produces an inhomogeneous waveguide, where a large portion of the total energy transverses the sensing layer. This yields much superior sensor performance. The transmission through a waveguide is subject to various disturbing influences. Thus it is advantageous to combine the inhomogeneous waveguiding approach with fluorescence lifetime-based sensors. The fluorescence lifetime of an indicator incorporated into the sensing layer is changed by the presence of the respective analyte. This lifetime is independent of the transmission through the waveguide. Thus both methods pave the way for optical chemical sensors with high analyte sensitivity and immunity to external disturbances.

Paper Details

Date Published: 19 November 2003
PDF: 2 pages
Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); doi: 10.1117/12.527476
Show Author Affiliations
Sonja Draxler, Karl-Franzens-Univ. Graz (Austria)
Max E. Lippitsch, Karl-Franzens-Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 4829:
19th Congress of the International Commission for Optics: Optics for the Quality of Life
Giancarlo C. Righini; Anna Consortini, Editor(s)

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