Sensitive Monitoring of Surface Reactions with Optical Waveguide Dynamic Spectroscopy

利用光波导动态光谱法灵敏监测表面反应

基本信息

批准号：
01550612
负责人：
ITOH Kiminori
金额：
$ 1.41万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550612/
关键词：
Solid surface Thin films Optical waveguide Iron Phosphate Spin-coating Tapered velocity coupler Peroxopolytungstic acids Glass optical waveguide 表面化学反応薄膜光導波路断熱遷移

项目摘要

1) Applying optical waveguides to monitoring solid surfaces. We have many important reactions taking place at solid surfaces. Thin films on the solid surfaces are also increasing its importance in industry. In conjunction with these, we proposed a use of optical wave-guide (OWG) for sensitive detec tion on chemical reactions on the surfaced of the solids and/or the thin films (1988).2) Development of OWG systems for surface monitoring, The following approaches were made in this project.2.1) A use of adiabatic transition of light in OWGs. An OWG with a thick guiding layer, and hence with small attenuation, was covered with a thin film OWG having high surface sensitivity. The two OWGs were combined with taper velocity couplers. As a typical example, we made FePO_4 thin film OWG on a glass OWG. It was found that the taper velocity coupler needs to be 0.5 mm long for the 0th mode, and 1 mm for the 1st mode to realize totally adiabatic conditions. A band OWG was constructed by using this technique, and relative sensitivity (S) was measured for surface species. The S values were about 10^3, being several tens of times as large as that for glass OWGs.2.2) New materials for OWG components. Thin films of peroxopolytungstic acids were made from their solutions and with spin-coating, and basic optical characteristics were examined to make OWG components. Their refractive indices were >2.0, being very high for thin films cured at 100^ﾟC. Thin film OWGs, ARROW type OWGs, and embossed grating were prepared from these thin films. Moreover, basic characteristics of glass OWGs were examined in detail to construct chemical sensors based on photochromism of WO_3.

1）应用光波导来监测固体表面。固体表面上的薄膜也越来越重要，因此我们提出了使用光波导（ OWG）用于对固体和/或薄膜表面的化学反应进行灵敏检测（1988）。2）开发用于表面监测的OWG系统，该项目采用了以下方法。2.1）使用光在 OWG 中的绝热跃迁。具有厚引导层并因此具有较小衰减的 OWG 被具有高表面灵敏度的薄膜 OWG 与锥度速度耦合器结合作为典型示例。玻璃 OWG 上的 FePO_4 薄膜 OWG 发现，对于第 0 模，锥度速度耦合器需要 0.5 mm 长，对于第 1 模，需要 1 mm 长。利用该技术构建了带OWG，并测量了表面物种的相对灵敏度（S），其S值约为10^3，是其的数十倍。玻璃OWG .2.2) 用于OWG 元件的新材料由其溶液和旋涂法制成，并检查了其基本光学特性以制备OWG 元件。 >2.0，对于在 100^ﾟC 下固化的薄膜来说非常高。此外，还详细研究了玻璃 OWG 的基本特性，以构建基于化学传感器的薄膜 OWG、ARROW 型 OWG 和浮雕光栅。 WO_3的光致变色现象。