Thin film composite optical waveguides for sensor applications: a review

A. Yimit, Axel Rossberg, T. Amemiya, K. Itoh

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


We review the design and fabrication of thin-film composite optical waveguides (OWG) with high refractive index for sensor applications. A highly sensitive optical sensor device has been developed on the basis of thin-film, composite OWG. The thin-film OWG was deposited onto the surface of a potassium-ion-exchanged (K+) glass OWG by sputtering or spin coating (5-9 mm wide, and with tapers at both ends). By allowing an adiabatic transition of the guided light from the secondary OWG to the thin-film OWG, the electric field of the evanescent wave at the thin film was enhanced. The attenuation of the guided light in the thin film layer was small, and the guided light intensity changed sensitively with the refractive index of the cladding layer. Our experimental results demonstrate that thin-film, composite OWG gas sensors or immunosensors are much more sensitive than sensors based on other technologies. (c) 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)1102-1109
Number of pages8
Issue number5
Publication statusPublished - 15 Mar 2005

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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