Design of a compact and high sensitive refractive index sensor base on metal-insulator-metal plasmonic Bragg grating.
Design of a compact and high sensitive refractive index sensor base on metal-insulator-metal plasmonic Bragg grating.
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DOI：
10.1364/oe.22.028662
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发表时间：
2014-11
期刊：
影响因子：
3.8
通讯作者：
Binfeng Yun;Guohua Hu;Zhang Ruohu;Yiping Cui
中科院分区：
文献类型：
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作者：
Binfeng Yun;Guohua Hu;Zhang Ruohu;Yiping Cui
提出了一种基于金属-绝缘体-金属等离子体布拉格光栅的纳米级高灵敏度折射率传感器。通过分析折射率传感器的透射光谱，研究了其波长编码传感特性。数值计算结果表明，传感器的布拉格波长与传感材料的折射率之间存在良好的线性关系，这与理论分析结果吻合得很好。在1, 550 nm的布拉格共振波长附近获得了1, 488 nm/RIU的高折射率灵敏度。此外，仿真结果表明，灵敏度取决于布拉格谐振波长，布拉格谐振波长越长，灵敏度越高。此外，通过在所提出的等离子体布拉格光栅结构中引入纳米腔，可以大大提高折射率传感器的品质因数。该工作为高灵敏度纳米折射率传感器的设计和应用奠定了基础。
A nanometric and high sensitive refractive index sensor based on the metal-insulator-metal plasmonic Bragg grating is proposed. The wavelength encoded sensing characteristics of the refractive index sensor were investigated by analyzing its transmission spectrum. The numerical results show that a good linear relationship between the Bragg wavelength and the refractive index of the sensing material can be obtained, which is in accordance with the analytical results very well. A high refractive index sensitivity of 1,488 nm/RIU around Bragg resonance wavelength of 1,550 nm was obtained. Besides, the simulation results show that the sensitivity is depended on the Bragg resonance wavelength and the longer the Bragg resonance wavelength, the higher sensitivity can be obtained. Furthermore, the figure of merit of the refractive index sensor can be greatly increased by introducing a nano-cavity in the proposed plasmonic Bragg grating structure. This work pave the way for high sensitive nanometric refractive index sensor design and application.