Coupling-Wave Structures for Optical Waveguide Sensors |
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| Authors: | De-Kui Qing Ichirou Yamaguchi Kiminori Itoh Masayuki Murabayashi |
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| Institution: | (1) The Institute of Physical and Chemical Research (RIKEN), Hirosawa, 2-1, Wako, Saitama 351-01, Japan;(2) Institute of Environmental Science and Technology, Yokohama National University, Tokiwadai, 79-7, Hodogaya-ku, Yokohama, Kanagawa 240, Japan |
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| Abstract: | An optical waveguide sensor structure, i.e. a coupling-wave structure, is presented and analyzed on the basis of a codirectional coupler. Potential uses for absorption-and fluorescence based sensors are theoretically explained by the group index method (D.-K. Qing, X-.M-. Chen, K. Itoh, M. Murabayashi: J. Lightwave Technol. 14 (1996) 1907). Refractive-index-based sensors were also analyzed. An actual coupling-wave structure was realized by combining the ion-exchange and the sol-gel methods. The coupling-wave structure that provides effective sensing interaction is easy to fabricate and can be used to realize optical waveguide chemical or biological sensors. |
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| Keywords: | codirectional coupler coupling wave optical waveguide sensors absorption-based sensors fluorescence-based sensors refractive-index-based sensors |
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