开环光子晶体光纤化学传感器的设计

为了提高低折射率化学物质监测的灵敏度，采用光子晶体光纤设计了一种在开环内镀有金薄膜的表面等离子体共振传感器。利用仿真软件COMSOL Multiphysics 5.6系统地研究了开环半径、内部气孔大小、金属膜层厚度对该传感器灵敏度的影响。最终在2800～4700 nm的工作波段内设计出折射率检测范围为1.26～1.31的低折射率传感器。该传感器平均灵敏度高达22 500 nm/RIU，最高灵敏度达33 000 nm/RIU。在七氟醚、卤代醚、含氟有机物等低折射率物质检测方向具有较好的应用前景。

Degsin of open-loop photonic crystal fiber chemical sensor

In order to improve the sensitivity of low refraction chemical monitoring, a surface plasmon resonance sensor based on photonic crystal fiber with gold film in open loop was designed in this paper. The effects of open-loop radius, pore size and thickness of metal film on the sensitivity of the sensor were studied systematically by using COMSOL Multiphysics 5.6. Finally, a low refractive index sensor with a refractive index detection range of 1.26-1.31 was designed in the working band of 2 800-4 700 nm. The average sensitivity of the sensor is as high as 22 500 nm/RIU, and the highest sensitivity is 33 000 nm/RIU. It has a good application prospect in the detection of low refractive index substances such as sevoflurane, haloether and fluorine-containing organic compounds.