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表面等离子体共振传感是基于光学消逝波与金属表面等离子体波共振的一种高灵敏度、快速、无标记的测量方式。光纤的表面等离子体共振传感具有在线测量、体积小、抗电磁干扰等优点。为提高折射率传感灵敏度,采用轮式侧边抛磨法抛磨掉多模光纤的全部包层和部分纤芯,并采用溅射法在光纤抛磨区先镀高折射率的铬层然后镀金膜,制作了侧边抛磨光纤表面等离子体共振传感器。研究结果表明:该传感器可实现液体折射率在1.333~1.431RIU范围的测试,平均光谱灵敏度为4.11×103 nm·RIU-1,在1.417~1.431RIU折射率范围内光谱灵敏度达1.09×104 nm·RIU-1,折射率测量范围和光谱灵敏度均优于已报道的结果。此外,该传感器具有良好的稳定性与重复性实验测试,最小分辨率约为3.6×10-5 RIU。该传感器光谱灵敏度高、检测范围大、尺寸小及良好的稳定性与重复性等优点,可被用于食品检测、环境监测、生物医学检测等相关领域。
Surface Plasmon Resonance Sensing is a highly sensitive, fast, unmarked measurement method based on optical evanescent waves and metal surface plasmon resonance. Optical fiber surface plasmon resonance sensing with online measurement, small size, anti-electromagnetic interference and so on. In order to improve the sensitivity of the refractive index sensing, the wheel-side polishing method is used to polish all the claddings and part of the core of the multimode optical fiber, and then the chrome layer with a high refractive index is first plated in the optical buffing area by a sputtering method and then Gold-plated film, produced a side polished fiber surface plasmon resonance sensor. The results show that the sensor can achieve the liquid refractive index of 1.333 ~ 1.431RIU range of the test, the average spectral sensitivity of 4.11 × 103 nm · RIU-1, in the 1.417 ~ 1.431RIU refractive index spectral sensitivity of 1.09 × 104 nm · RIU-1, refractive index measurement range and spectral sensitivity are better than the reported results. In addition, the sensor has good stability and repeatability of experimental tests, the minimum resolution of about 3.6 × 10-5 RIU. The sensor has the advantages of high spectral sensitivity, large detection range, small size, good stability and repeatability, and can be used in food testing, environmental monitoring, biomedical testing and other related fields.