Fabrication of Spot Size Converters for Optical Chemical Sensors by Distributed-Field-Assisted Ion-Exchange |
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Authors: | De-Kui Qing Kiminori Itoh Masayuki Murabayashi |
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Affiliation: | (1) Institute of Environmental Science and Technology, Yokohama National University, Tokiwadai, 156, Hodogaya-ku, Yokohama 240, Japan |
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Abstract: | We propose a new method for fabricating optical waveguides with nonuniform thickness by controlling the electrical field distribution during the field-assisted ion-exchange. We refer to this method as distributed-fild-assisted ion-exchange. The distribution of the intensity of the electrical field was simulated for different electrode configurations, and was compared with experimental diffusion depth distribution of K+—Na+ exchange in sodalime slide glass. A unique bath was designed for the distributed-field-assisted ion-exchange. Using a three-electrode configuration, we obtained, for instance, a 2 cm-long spot size converter with thickness changes of from 12 μm to 2 μm. This technique can be used to fabricate waveguides for optical chemical sensors.On leave from State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, China 100080. |
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Keywords: | fabrication optical waveguide spot size converter optical chemical sensor distributed-field-assisted ion-exchange |
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