Sensing and reference pads for integrated optical immunosensors

Juerg Duebendorfer; Rino E. Kunz; E. Schuermann; Gert L. Duveneck; Markus Ehrat

doi:10.1117/12.281487

1 October 1997 Sensing and reference pads for integrated optical immunosensors

Juerg Duebendorfer, Rino E. Kunz, E. Schuermann, Gert L. Duveneck, Markus Ehrat

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Journal of Biomedical Optics, Vol. 2, Issue 4, (October 1997). https://doi.org/10.1117/12.281487

Abstract

For integrated optical immunosensors, a much more reliable interpretation of the sensor output signal can be achieved by introducing reference pads near the sensing pads, in order to separate specific from nonspecific effects. The results of theoretical and experimental investigations are reported for immunosensors based on measuring changes of the effective refractive index due to the binding of analyte molecules. The emphasis is on the correction for variations of the light wavelength, the angle of incidence, and the temperature for integrated optical grating coupler chips. Using the binding of rabbit immunoglobulin to immobilized protein A as a regenerable model bioaffinity system, the influence of consecutive assay cycles on the two pads hasbeen investigated. Experiments have been performed using sensor chips consisting of TiO₂ waveguiding films on fused silica and on replicated polycarbonate substrates.

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Juerg Duebendorfer, Rino E. Kunz, E. Schuermann, Gert L. Duveneck, and Markus Ehrat "Sensing and reference pads for integrated optical immunosensors," Journal of Biomedical Optics 2(4), (1 October 1997). https://doi.org/10.1117/12.281487

Published: 1 October 1997

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Cited by 10 scholarly publications and 5 patents.

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KEYWORDS

Sensors

Refractive index

Proteins

Transducers

Integrated optics

Tolerancing

Lawrencium

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