基于表面等离子体共振的光子晶体光纤甲烷气体传感器

Methane Gas Sensor Based on Surface Plasmon Resonance and Photonic Crystal Fiber

将表面等离子体技术与光纤传感技术相结合,提出并仿真验证一种具有高灵敏度的D型基于表面等离子体共振的光子晶体光纤甲烷气体传感器;在光纤的抛磨表面外侧沉积金属纳米条,甲烷敏感材料涂覆于光纤抛磨表面外侧与金属外表面,利用D型结构使甲烷敏感材料与甲烷气体充分反应;通过有限元矢量软件COMSOL进行模拟仿真,比较传统金属层与金属条之间的传感性能差异。结果表明,当入射波长由0.9μm增加到1.1μm,并且甲烷气体体积分数测量区间为0~3%时,该传感器的平均光谱灵敏度为10 nm。

Combining surface plasmon technology with fiber sensing technology,a high sensitivity D-type methane gas sensor based on surface plasmon resonance and photonic crystal fiber was proposed and verified by using simulation.Metal nanostrips were deposited on the outside polished surface of the optical fiber,and methane-sensitive materials were coated on outside polished surfaces of optical fibers and metal surfaces.The D-type structure promoted sufficient reaction between methane-sensitive materials and methane gas.By means of analog simulation using finite element vector software COMSOL,the difference of sensing performance between traditional metal layer and metal strip was compared.The results show that when the incident wavelength increases from 0.9μm to 1.1μm,and the measurement range of methane gas volume concentration is from 0 to 3%,the average spectral sensitivity of the sensor is 10 nm.