Thin film composite optical waveguides for sensor applications: a review
- 作者：Yimit ; Abliz ; Rossberg ; Axel G. ; Amemiya ; Takashi ; Itoh ; Kiminori
- 关键词：Composite optical waveguide ; Thin film ; Biochemical sensors ; Refractive index sensor
- 刊名：Talanta
- 出版年：2005
- 期刊代码：106_00399140
- 类别：ch
- 出版时间：March 15, 2005
- 卷：65
- 期：5
- 页码：1102-1109
- 文件大小：271 K
摘要
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.