| 双层介质加载等离子体微环的高灵敏生物传感 |
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| 引用本文： | 刘恒,马涛,余重秀,高金辉.双层介质加载等离子体微环的高灵敏生物传感[J].红外与激光工程,2017,46(3):322003-0322003(5). |
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| 作者姓名： | 刘恒 马涛 余重秀 高金辉 |
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| 作者单位： | 1.河南师范大学 电子与电气工程学院,河南 新乡 453007; |
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| 基金项目： | 河南省重点科技攻关项目（132102210043）;河南师范大学青年科学基金（2011QK08，2012QK08） |
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| 摘 要： | 为了提高介质加载表面等离子体的传输距离，提出了基于双层介质加载的表面等离子体波导结构。利用有限元方法研究了介质加载的表面等离子体波导的模场分布及传输特性，并对其传感应用的波导灵敏度进行了分析。研究表明， 当低折射率介质厚度占波导总厚度的33%时，传输距离是单层介质加载表面等离子体波导的2.4倍。利用该波导结构组成的微环谐振腔被用于生物传感研究，其传感特性分析表明，传感灵敏度为411 nm/RIU，检测极限为1.210-5 RIU。双层混合介质加载表面等离子体波导的设计和研究为其进行无标记生物传感应用提供了有价值的指导。
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| 关 键 词： | 表面等离子体波导 介质加载 微环谐振腔 生物传感 |
| 收稿时间： | 2016-07-05 |
Highly sensitive biosensor based on two-layer dielectric-loaded plasmonic microring |
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| Affiliation: | 1.College of Electronic and Electrical Engineering,Henan Normal University,Xinxiang 453007,China;2.Henan Key Discipline Open Laboratory of Electromagnetic Wave Detecting,Xinxiang 453007,China;3.State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China |
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| Abstract: | In order to realize long propagation length, a two-layer dielectric-loaded surface plasmon polaritions(TDL-SPPs) waveguide was proposed． The mode field distributions and propagation properties of the TDL-SPPs waveguide were studied by using finite element method(FEM). The waveguide sensitivity was also studied. The results show that the propagation length of the proposed TDL-SPPs waveguide is 2.4 times as much as that of the conventional dielectric-loaded surface plasmon polaritons(DL-SPPs) waveguide. The TDL-SPPs microring resonator based highly sensitive biosensor was demonstrated. The results show that the sensitivity is more than 411 nm/RIU and the detection limit is less than 1.210-5 RIU. The design and research on the biosensor based on TDL-SPP microring resonator is a valuable exploration in biosensing application with high sensitivity. |
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