Liu Lian, Deng Shijie, Zheng Jie, Yuan Libo, Deng Hongchang, Teng Chuanxin
Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China.
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Sensors (Basel). 2021 Feb 22;21(4):1516. doi: 10.3390/s21041516.
An enhanced plastic optical fiber (POF)-based surface plasmon resonance (SPR) sensor is proposed by employing a double-sided polished structure. The sensor is fabricated by polishing two sides of the POF symmetrically along with the fiber axis, and a layer of Au film is deposited on each side of the polished region. The SPR can be excited on both polished surfaces with Au film coating, and the number of light reflections will be increased by using this structure. The simulation and experimental results show that the proposed sensor has an enhanced SPR effect. The visibility and full width at half maximum (FWHM) of spectrum can be improved for the high measured refractive index (RI). A sensitivity of 4284.8 nm/RIU is obtained for the double-sided POF-based SPR sensor when the measured liquid RI is 1.42. The proposed SPR sensor is easy fabrication and low cost, which can provide a larger measurement range and action area to the measured samples, and it has potential application prospects in the oil industry and biochemical sensing fields.
提出了一种基于增强型塑料光纤（POF）的表面等离子体共振（SPR）传感器，采用双面抛光结构。该传感器通过沿光纤轴对POF的两侧进行对称抛光来制造，并且在抛光区域的每一侧沉积一层金膜。在涂有金膜的两个抛光表面上都可以激发表面等离子体共振，并且使用这种结构会增加光反射的次数。仿真和实验结果表明，所提出的传感器具有增强的表面等离子体共振效应。对于高测量折射率（RI），光谱的可见度和半高宽（FWHM）可以得到改善。当测量液体的RI为1.42时，基于双面POF的SPR传感器的灵敏度为4284.8 nm/RIU。所提出的SPR传感器易于制造且成本低，可为被测样品提供更大的测量范围和作用面积，在石油工业和生化传感领域具有潜在的应用前景。
