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提出了一种契形端面结构的光纤表面等离子体共振(SPR)传感器激励模型.采用时域有限差分法对契形SPR波导的共振模型进行数值模拟,通过在光纤出射端抛磨契形角度并进行敏感膜修饰,制出具有契形端面结构的类Kretschmann微棱镜式光纤SPR传感器,实现激发SPR的光波调制.结果表明,在1.3330—1.4215折射率范围内,制备的契形光纤SPR传感器相对于常规光纤SPR传感器,其平均灵敏度提高了近1—6倍,1倍和6倍分别出现在小角度结构(15°契形)传感器和大角度结构(60°契形)传感器,且仍保持10-5等级的分辨率.该类型结构的传感器具有契形端面激励模式,设计灵活性高、制备工艺简单、可微量检测样本等优点,能够很好地适应于不同环境和测量条件的实际生化检测、环境监测需求.
An excitation model of optical fiber surface plasmon resonance (SPR) sensor with deformable end face structure was proposed.The resonance model of deformable SPR waveguide was numerically simulated by finite difference time domain method. The Kretschmann microprism SPR sensor with a deformable end-face structure was fabricated to modulate the SPR excited light.Results show that in the refractive index range of 1.3330-1.4215, the deformable SPR sensor fabricated with respect to the Conventional fiber optic SPR sensors, with an average sensitivity of approximately 1-6 times, 1x and 6x, respectively, appear in small angle structures (15 ° deformable) and large angle (60 ° deformable) sensors and still maintain 10 -5 level resolution.The sensors of this type of structure have the advantages of deformable end surface excitation mode, high design flexibility, simple preparation process and traceable sample detection, which can be well adapted to the actual biochemical detection under different environments and measurement conditions Environmental monitoring needs.