Development of an Optical Waveguide Interferometric Immunosensor

Rene Heideman, R.P.H. Kooyman, Jan Greve

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Abstract

A Mach-Zehnder interferometer is presented, which uses the evanescent field of a planar optical waveguide as the sensing element. Changes in the refractive index profile occurring in the immediate vicinity of the waveguide surface cause the propagation velocity of the light passing through it to change. This is measured interferometrically. Adsorption processes of antibodies onto the waveguide surface as well as immunoreactions have been monitored. Concentrations of 2.5 × 10¿8 M (1 × 10-3 mg/ml) of the antigen HCG (molecular weight = 39 600) have been measured so far.
Original languageUndefined
Pages (from-to)297-299
Number of pages3
JournalSensors and actuators. B: Chemical
Volume4
Issue number3-4
DOIs
Publication statusPublished - 1991

Keywords

  • METIS-129440
  • IR-24639

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