基于氧化石墨烯涂层的侧抛光纤马赫-曾德尔干涉仪温湿度传感器

Temperature and Humidity Sensor Based on a Graphene Oxide-Coated Side-Polished Fiber Mach-Zehnder Interferometer

对基于微锥的侧抛光纤马赫-曾德尔干涉仪(MZI)结构进行了理论和实验研究。与传统没有经过侧边抛磨的光纤MZI相比,可以看出控制光纤侧抛深度可以有效地提高MZI结构的折射率传感性能。研究结果表明:侧抛深度达41.7μm时,折射率在1.34附近的传感灵敏度达-117.145 nm/RIU。利用侧抛光纤MZI结构结合亲水性材料氧化石墨烯(GO),通过将其沉积在侧抛光纤MZI表面,实现了对温度和湿度双参量的同时测量。温度和相对湿度(RH)的传感灵敏度分别达131.77 pm/℃和-76.1 pm/%RH。所提侧抛光纤MZI传感器结构具有灵敏度高、低成本和制备简单等优点,在生物化学传感领域具有广泛的应用前景。

In this paper, we carried out theoretical and experimental research on the structure of a side-polished fiber Mach-Zehnder interferometer(MZI) based on a microtaper. To be specific, after the side-polished depth of the fiber was appropriately controlled, the refractive index(RI) sensing performance of the MZI was much better than that of a traditional fiber MZI without side polishing. Besides, the research results showed that when the side-polished depth reached 41.7 μm, the sensitivity of RI sensing was-117.145 nm/RIU at the RI of about 1.34. Furthermore, we measured the temperature and humidity simultaneously by depositing the hydrophilic graphene oxide(GO) on the surface of the side-polished fiber MZI, obtaining the sensitivity of temperature and relative humidity sensing of 131.77 pm/℃ and-76.1 pm/%RH, respectively. In conclusion, the proposed side-polished fiber MZI has the advantages of high sensitivity, low cost, and simple fabrication, thus displaying a wide range of application prospects in the field of biochemical sensing.