| 基于表面等离子体共振的新型超宽带微结构光纤传感器研究 |
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| 引用本文： | 丁子平,廖健飞,曾泽楷.基于表面等离子体共振的新型超宽带微结构光纤传感器研究[J].物理学报,2021(7):167-172. |
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| 作者姓名： | 丁子平 廖健飞 曾泽楷 |
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| 作者单位： | 赣南师范大学物理与电子信息学院 |
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| 基金项目： | 国家自然科学基金(批准号:61765003);江西省自然科学基金(批准号:20181BAB202029);赣南师范大学研究生创新基金(批准号:YCX19A043)资助的课题. |
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| 摘 要： | 基于表面等离子体共振的微结构光纤传感器具有高灵敏、免标记和实时监控等优点.如今,由于此类传感器广泛应用于食品安全控制、环境检测、生物分子分析物检测等诸多领域而受到大量研究.然而,目前所报道的绝大多数此类传感器只能应用于可见光或近中红外传感.因此,对可应用于中红外传感的表面等离子体共振微结构光纤传感器的研究是一项极具挑战性的工作.基于此,本文设计了一种可以工作在近红外和中红外区域的新型高灵敏表面等离子体共振微结构光纤传感器.传感器采用双芯单样品通道结构,该结构不仅可以消除相邻样品通道间的相互干扰和提高传感器的信噪比,还可以在超宽带波长范围内实现高灵敏检测.采用全矢量有限元法对其传感特性进行了系统的研究,研究结果表明:当待测样品折射率分布在1.423—1.513范围内时,传感器不仅可以在1.548—2.796μm的超宽带波长范围内进行工作,而且其平均灵敏度高达13964 nm/RIU.此外,传感器的最高波长灵敏度和折射率分辨率分别为17900 nm/RIU,5.59×10–7 RIU.
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| 关 键 词： | 光纤光学 微结构光纤 表面等离子体共振 传感器 |
A new type of ultra-broadband microstructured fiber sensor based on surface plasmon resonance |
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| Ding Zi-Ping,Liao Jian-Fei,Zeng Ze-Kai.A new type of ultra-broadband microstructured fiber sensor based on surface plasmon resonance[J].Acta Physica Sinica,2021(7):167-172. |
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| Authors: | Ding Zi-Ping Liao Jian-Fei Zeng Ze-Kai |
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| Affiliation: | (College of Physics and Electronic Information,Gannan Normal University,Ganzhou 341000,China) |
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| Abstract: | Microstructured fiber(MF)sensors based on surface plasmon resonance(SPR)have been widely investigated because they have many merits including high sensitivity,label-free and real-time detection and so on,thus they possess extensive applications such as in food safety control,environmental monitoring,biomolecular analytes detection,antibody-antigen interaction,liquid detection and many others.However,most of reported SPR-based MF sensors can only work in the visible or near-infrared wavelength region.Hence,the investigation of high-performance mid-infrared SPR-based MF sensors is a challenge task.In this paper,with the aim of overcoming the above limitation,a new type of high-sensitivity SPR-based MF sensor coated with indium tin oxide(ITO)layer is proposed.The proposed sensor can work in both the near-infrared and midinfrared wavelength region.Benefitting from its two-core and single analyte channel structure,our proposed sensor can effectively eliminate the interference among neighboring analyte channels,improving its signal-tonoise ratio,and achieving high-sensitivity detection in ultra-broadband wavelength range.By using the fullvector finite method with the PML boundary conditions,the sensing properties of our proposed sensor are numerically studied in detail.The numerical results show that the resonance wavelength of the proposed sensor shifts toward a long wavelength region as the refractive index of analyte increases from 1.423 to 1.513,and a similar phenomenon can be found if the thickness of the ITO layer increases from 40 nm to 60 nm.Nevertheless,the wavelength sensitivity of the proposed sensor decreases with the increase of the diameter of the hole located in the fiber core region.On the other hand,when the refractive index of analyte varies in a large range of 1.423–1.513,the proposed sensor can operate in an ultra-broad wavelength range of 1.548–2.796μm,and the average wavelength sensitivity is as high as 13964 nm/refractive index unit(RIU).Moreover,the maximum wavelength sensitivity and refractive index resolution increase up to 17900 nm/RIU and 5.59×10–7 RIU,respectively.Hence,our proposed SPR-based MF sensor can be applied to environmental monitoring,biomolecular analyte detection and chemical detection. |
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| Keywords: | fiber optics microstructured fiber surface plasmon resonance sensor |
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