A side-polished single mode optical fiber based on conventional long-range surface plasmon resonance (cLRSPR) sensor and symmetrical long-range surface plasmon resonance (sLRSPR) sensor was proposed and experimentally demonstrated. The proposed structure of cLRSPR is composed of optical fiber/dielectric buffer layer (DBL)/Ag film while for sLRSPR is consisted of optical fiber/DBL/Ag film/DBL. Magnesium fluoride, MgF₂ with 50 nm thickness is used as DBL layer that lies beneath of Ag film in cLRSPR and covering both sides of Ag film in sLRSPR. 40 nm thickness of Ag layer is used with 5 mm length of sensing region. The result suggested that the sensing performance in terms of sensitivity of the cLRSPR sensor was better compared to sLRSPR and previous works of conventional surface plasmon resonance (cSPR) as it achieves as high as 2812.5 nm/RIU at 0.01 interval of refractive index with refractive index (RI) range of 1.33–1.34. The larger the sensitivity value indicates the better the performance of the SPR sensor. This design is expected to play an important role on chemical sensing and biological sensing as it displays higher penetration depth.

提出了一种基于常规远程表面等离子体共振（cLRSPR）传感器和对称远程表面等离子体共振（sLRSPR）传感器的侧抛光单模光纤，并进行了实验验证。提出的cLRSPR结构由光纤/介电缓冲层（DBL）/ Ag膜组成，而sLRSPR的结构由光纤/ DBL / Ag膜/ DBL组成。氟化镁，MgF ₂具有50 nm厚度的DBL层用作cLRSPR中的Ag膜的下面，并覆盖sLRSPR中的Ag膜的两面。使用厚度为40 nm的Ag层，感应区域的长度为5 mm。结果表明，与sLRSPR和以前的传统表面等离振子共振（cSPR）的工作相比，cLRSPR传感器的感测性能更好，因为它在折射率与折射率的0.01间隔内可达到2812.5 nm / RIU （RI）的范围为1.33–1.34。灵敏度值越大表示SPR传感器的性能越好。由于该设计显示出更高的穿透深度，因此有望在化学传感和生物传感中发挥重要作用。