A D-shaped fiber based long-range surface plasmon resonance (LRSPR) sensor with high quality factor ( $Q$ -factor) of 67.75 RIU⁻¹ and temperature self-compensation was proposed and demonstrated. The multilayered architecture of the LRSPR sensor consisted of fiber/dielectric buffer layer (DBL)/Au film/analyte, and the deep penetration depth and long propagation distance of long-range surface plasmon polaritons made the LRSPR sensor possess high $Q$ -factor. The temperature-sensitive photoabsorption characteristic of the Terbium(III) complexes was utilized to provide temperature self-compensation for the refractive index (RI) measurement of the LRSPR sensor, and the LRSPR sensor realized simultaneous measurement of RI and temperature at the exact same location, which could eliminate the measurement error introduced by temperature to RI measurement. The simulation analysis, supported by finite element analysis (FEA) based on coupled-mode theory, was presented in detail. The simulation results showed that the electric field intensity on the surface of the LRSPR sensor was 2.52 times higher than that of the surface plasmon resonance (SPR) sensor and the sensitivity of the LRSPR sensor increased by 947.31 nm/RIU compared with the SPR sensor, implying the LRSPR sensor possessed more excellent sensing performance. An SPR sensor and a Terbium(III) complex-based LRSPR sensor were developed, and their RI sensing performance was systematically studied and tabulated. The experimental results showed that the $Q$ -factor of the LRSPR sensor was 2.56 times higher than that of the SPR sensor, which agreed well with the simulation results. The LRSPR sensor proposed in this paper possessed higher detection precision and presented greatly promising application prospects in the field of biochemistry.

中文翻译：

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一种具有高Q因数和温度自补偿的D形光纤远距离表面等离子体共振传感器

一种基于 D 形光纤的高品质因子远程表面等离子体共振 (LRSPR) 传感器 ( $Q$ -factor) 为 67.75 RIU ^-1和温度自补偿被提出并证明。LRSPR传感器的多层结构由光纤/电介质缓冲层（DBL）/Au膜/分析物组成，远距离表面等离子体激元的深穿透深度和长传播距离使LRSPR传感器具有高 $Q$ -因素。利用铽（III）配合物的温敏光吸收特性，为LRSPR传感器的折射率（RI）测量提供温度自补偿，LRSPR传感器实现了在完全相同的位置同时测量RI和温度，可以消除温度对RI测量引入的测量误差。详细介绍了基于耦合模式理论的有限元分析 (FEA) 支持的仿真分析。仿真结果表明，LRSPR传感器表面的电场强度是表面等离子体共振（SPR）传感器的2.52倍，LRSPR传感器的灵敏度比SPR传感器提高了947.31 nm/RIU，这意味着 LRSPR 传感器具有更出色的传感性能。开发了SPR传感器和基于铽（III）复合物的LRSPR传感器，并对它们的RI传感性能进行了系统研究和制表。实验结果表明， $Q$ LRSPR 传感器的 -factor 是 SPR 传感器的 2.56 倍，与仿真结果非常吻合。本文提出的LRSPR传感器具有较高的检测精度，在生物化学领域具有广阔的应用前景。