Highly Sensitive Porous-silicon-formed Bio-chemical Waveguide Sensors Based On Novel Coupling Approaches

This article gave a detailed, insightful analysis of current research status of optical structure based biochemical sensors, and the brief research history of biochemical sensors, with also the history of sensing materials generation was brought up, too. Based on these researches, the research status of optical waveguide based sensors were focused on in this article. And with current a most promising material for sensing, porous silicon, selected as the material for this research, 3 kinds of highly sensitive waveguide based biochemical sensors with novel coupling methods were proposed.For these 3 kinds of waveguide sensors with novel coupling methods, the article brought up with the coupling principles of each structure based on theoretical analysis. Besides, with the help of currently matured theoretical approaches, such as rigorous coupling wave approach, simulation models of these 3 structures were generated with the aid of Matlab. Based on these models, the sensing characteristics, coupled mode properties and the sensitivity characteristics of these 3 structures were deeply and widely analyzed. And finally, design rules, or guide lines, for these structures were given. The article also introduced the fabrication processes of these structures, and made accountable comparisons between the experimental and simulation results.Based on the material characteristics of porous silicon, sensing models for these 3 structures was brought to front. The advantages of porous silicon were discussed, and the great potential of this kind of sensing material was also talked about.At the end of this article, the author gave his point of view for the research tendency of these biochemical sensors based on novel coupling approaches.