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摘要

为了提高现有的亚波长量级温度传感器和折射率传感器的各项工作性能, 本文基于表面等离激元提出了一种拥有尖锐峰的高灵敏度、高集成度的环八边形表面等离子体共振传感器. 理论分析了以乙醇作为热敏填充材料使温度和有效折射率建立线性转换关系的可行性, 并利用多模耦合模式理论(MICMT)对该传感器的透射峰进行了拟合和理论分析, 再利用有限元法(FEM)进行了仿真分析, 理论结果和仿真结果高度匹配. 然后对环八边形共振腔的各项参数进行了有限元数值模拟, 计算得出该传感器的最佳参数设置. 和以往结构设计对比, 该两用传感器拥有工作波段范围广、半峰全宽窄、易于集成等诸多优点, 作为传感器的温度灵敏度和折射率灵敏度分别高达0.9 nm/℃和2400 nm/RIU. 该结构兼具一些传统腔体的优点, 为以后基于表面等离激元设计的微纳光子温度传感和折射率传感两用器件提供了一种高性能的腔体选择.

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Abstract

In order to enhance the working performance of existing temperature sensor and refractive index sensor of sub-wavelength waveguide, the design of ring regular octagon surface plasmon resonance sensor with sharp transmission peak, high sensitivity and high integration was proposed in this paper based on surface plasmon polaritons. The feasibility of using ethanol as a thermosensitive filler to establish a linear conversion relationship between temperature and effective refractive index was analyzed theoretically. The reason why the real part of effective refractive index changes abruptly with the change of waveguide width is also explained. The multimode interference coupled mode theory (MICMT) was used to fit and analyze the transmission peak of the sensor, and then the finite element methods (FEM) is used for simulation analysis. Results obtained by the theory of the MICMT are consistent very well with those from simulation. In order to obtain the optimal parameter setting of the ring regular octagon surface plasmon resonance sensor, various parameters of the sensor are simulated by FEM. It is found that increasing Land decreasing Hwill improve the sensitivity of the sensor, while decreasing parameter wcan not only improve the amplitude of transmission peak, but also keep the sensitivity unchanged. This characteristic of parameter wgreatly improves the robustness of the sensor. All kinds of physical phenomena in this paper are analyzed in detail. Firstly, the phenomenon of transmission peak displacement caused by parameter changes is explained through the analysis of magnetic field distribution, and then the phenomenon of inconsistent sensitivity of different transmission peaks is explained through photon energy formula. Compared with the previous structural design, the dual-purpose sensor has many advantages such as wide operating wavelength range, narrow full width at half maximum and easy to integrate. As a temperature sensor and refractive index sensor, its sensitivity was as high as 0.9 nm/℃ and 2400 nm/RIU. The study of this structure broke through the limitations of some traditional cavities, in order to provide a high- performance cavity selection for the micro-nano photon temperature and refractive index dual-purpose sensor based on the design of surface plasmon polaritons in the future.

Keywords:

surface plasmon polaritons/
temperature sensor/
refractive index sensor/
multimode interference coupled mode theory

作者及机构信息

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通信作者:祁云平,qiyunping@nwnu.edu.cn

基金项目:国家级-国家自然科学基金(61367005, 61865008)

Authors and contacts

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Corresponding author:Qi Yun-Ping,qiyunping@nwnu.edu.cn

文章全文: translate this paragraph

参考文献

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施引文献

下载: 全尺寸图片幻灯片

参考文献	温度传感器	折射率传感器	半峰全宽	共振峰数	工作波段/nm	FOM
参考文献	S/nm·℃	S/nm·RIU^–1	FWHM/nm	共振峰数	工作波段/nm	FOM
[20]	1.36	3460	≈200	3	500—2000	≈17.3
[24]	0.65		50.6	2	600—1700
[29]		1500	≈80	3	600—2000	≈18.7
[31]	0.51	1736	177.3	1	550—900	9.79
This work	0.9	2400	18	5	700—3200	133

下载: 导出CSV

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