Inhomogeneous waveguiding structures for optical sensors

Sonja Draxler; Max E. Lippitsch

doi:10.1117/12.527476

19 November 2003 Inhomogeneous waveguiding structures for optical sensors

Sonja Draxler, Max E. Lippitsch

Proceedings Volume 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life; (2003) https://doi.org/10.1117/12.527476
Event: 19th Congress of the International Commission for Optics: Optics for the Quality of Life, 2002, Florence, Italy

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.

Citation Download Citation

Sonja Draxler and Max E. Lippitsch "Inhomogeneous waveguiding structures for optical sensors", Proc. SPIE 4829, 19th Congress of the International Commission for Optics: Optics for the Quality of Life, (19 November 2003); https://doi.org/10.1117/12.527476

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