A new optical waveguide (OWG) with a composite structure was designed and fabricated for chemical and biological sensing applications. The composite OWG consists of a uniform TiO2 film and a pair of tapered SiO2 films coated together on the surface of a single-mode potassium ion-exchanged (PIE) planar waveguide. By use of the TiO2 film-covered SiO2 tapers as optical directional couplers,the TiO2 film becomes a single-mode waveguiding layer with an enhanced evanescent field and an increased surface-scattering loss. Such composite structure can be used to make a polarimetric OWG interferometer and to make the polarization-insensitive PIE waveguide a TM polarizer. The composite OWG was characterized theoretically and experimentally.


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  1. Z.-M. Qi, K. Itoh, M. Masayuki and H. Yanagi, "A composite optical waveguide-based polarimetric interferometer for chemical and biological sensing applications", J. Lightwave Technol., vol. 18, pp. 1106-1110, Aug. 2000.
  2. Z.-M. Qi, K. Itoh, M. Murabayashi and C. R. Lavers, "Characterization and application of a channel-planar composite waveguide", Opt. Lett., vol. 25, pp. 1427-1429, 2000.

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