| 基于光子晶体光纤模间干涉的折射率测量灵敏度分析 |
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| 引用本文： | 侯建平,宁韬,盖双龙,李鹏,郝建苹,赵建林.基于光子晶体光纤模间干涉的折射率测量灵敏度分析[J].物理学报,2010,59(7):4732-4737. |
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| 作者姓名： | 侯建平 宁韬 盖双龙 李鹏 郝建苹 赵建林 |
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| 作者单位： | 西北工业大学理学院,空间应用物理与化学教育部重点实验室,陕西省光信息技术重点实验室,西安,710072 |
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| 基金项目： | 西北工业大学基础研究基金(批准号:G9KY1018/09)资助的课题. |
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| 摘 要： | 通过理论分析和数值模拟,研究了一种基于光子晶体光纤(PCF)模间干涉的干涉计的灵敏度.根据光纤模间干涉理论,结合光子晶体光纤的归一化频率,分析了PCF干涉计测量气体折射率的原理,得到一个可以衡量PCF干涉计灵敏度的参数δns.通过对该参数物理意义的分析可以得出,PCF纤芯附近第一层气孔对灵敏度影响最大.相比于常规气孔结构,把PCF第一层气孔变为面积更大的圆与椭圆复合孔,可显著提高传感灵敏度.
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| 关 键 词： | 光子晶体光纤 模间干涉 气体传感 灵敏度 |
| 收稿时间： | 2009-10-07 |
Sensitivity analysis of refractive index measurement based on intermodal interference in photonic crystal fiber |
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| Hou Jian-Ping,Ning Tao,Gai Shuang-Long,Li Peng,Hao Jian-Ping,Zhao Jian-Lin.Sensitivity analysis of refractive index measurement based on intermodal interference in photonic crystal fiber[J].Acta Physica Sinica,2010,59(7):4732-4737. |
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| Authors: | Hou Jian-Ping Ning Tao Gai Shuang-Long Li Peng Hao Jian-Ping Zhao Jian-Lin |
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| Institution: | Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China;Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China;Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China;Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China;Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China;Key Laboratory of Optical Information Technology of Shaanxi Province, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi' an 710072, China |
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| Abstract: | The sensitivity of an interferometer based on intermodal interference in photonic crystal fiber (PCF) has been investigated theoretically and numerically. Using the intermodal interference theory and the normalized frequency of PCF, we have analyzed the principle of the method for measuring refractive index by PCF interferomter,and obtained a variation, δns, to show the sensitivity of the PCF interferometer. From the analysis of the underlying physics of δns, we find that air holes of the first layer play an important role on the sensitivity.Compared with the conventional PCF structure,the sensitivity can be improved remarkably via employing large air holes with the shape of a combination of half circle and half oval. |
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| Keywords: | photonic crystal fiber intermodal interference gas sensor sensitivity |
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