| 王冠军,谭绪祥,王志斌.用于液体Raman检测的开放式悬挂芯光纤特性研究[J].光电子激光,2015,26(4):712~718 |
| 用于液体Raman检测的开放式悬挂芯光纤特性研究 |
| Research on the characteristics of opened hole suspended core fiber for fluidic Raman detection |
| 投稿时间：2015-01-05 |
| DOI： |
| 中文关键词: Raman检测 悬挂芯光纤 开放式光纤 |
| 英文关键词:Raman detection suspended core fiber opened hole fiber |
| 基金项目:国家自然科学基金青年项目(61405127)、山西省青年基金 (2014021023-1)和国 家博士后基金(2014M562202)资助项目 (中北大学 仪器科学与动态测试教育部重点实验室,中北大学电子测试技术重点实验室,山西 太原 030051) |
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| 中文摘要: |
| 提出 利用结构牢固、易于气体扩散的开放式微结构光纤提升Raman检测系统的响应速度,并 根据前向/后向Raman耦合的Raman信号公式对液体光纤Raman检测系统结构进行了优化。 分析表明,存在一最佳的悬挂芯光纤纤芯半径,使得耦合接收的Raman信号最佳；较细的 悬臂厚度有利于提高耦合接收的Raman信号强度；随着流体折射率值的增加,最佳纤 芯半径有所增加,而且相应的Raman信号有所下降。此外,还分析了封闭式悬挂芯光 纤和纳米光纤结构与Raman强度的相互关系,并对3种结构的Raman特性进行了对比。 |
| 英文摘要: |
| In order to accelerate the fluid flow and enhance the optical sensitivity for liquid sensing application,a robust opened hole suspended core fiber configuration based on t he forward/backward Raman coupling detection mechanism is proposed and analyzed.A formula for forward/backward Raman coupling is utilized to study the dependence of Raman intensity on base materials and fiber size.The Raman signal intensity model is deduced based on the Raman scattering effect and waveguide theory.The field distributions,effective mode index,normalized overlap intensity (NOI),effective mode area and confinement loss are calculated .The results show that the final detected Raman signal intensity is not only determined by the overla p.T he effective mode area and transmission loss also play important roles.There is an optimized fibe r core size for exciting the maximum Raman signal intensity,while the optimized fiber core size is related with the fluidic refractive index.For silica-based fiber,the optimal fiber core ra dius region is around 150nm when the strut′s thickness is around 20nm－200nm.While with the increa se of fluidic index,the optimized core radius size is increased,while corresponding Ram an signal intensity is decreased.Besides,the Raman characteristics of closed hole suspended core fibe r and nanofiber are also compared with those of the proposed opened hole suspended core fiber. |
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