U-shaped micro-groove fiber based on femtosecond laser processing for humidity sensing

Abstract

A novel optical fiber sensor with a U-shaped micro-groove structure ablated by femtosecond laser on single-mode fiber for measuring air relative humidity (RH) is reported in this paper. In order to improve the accuracy of sensor, a graphene oxide (GO)/polyvinyl alcohol (PVA) composite film is coated on the surface of micro-groove structure. In the U-shaped micro-groove structure, the remaining core and micro-cavity in the micro-groove make up two major optical propagation paths, forming a Mach-Zehnder interferometer (MZI). The sensor has a good linear response within the RH range of 30%—85%, and the maximum sensitivity can reach 0.638 1 nm/%RH. The effect of temperature on the overall performance of the humidity sensor is also investigated. As a new type of all-fiber device, the sensor shows excellent sensitivity and stability.

Keywords

A

References

[1] Peter JT, Jon OH. Sensors & Actuators B. 2017, 247: 284

[2] Cheng Y, Xie W-j, Yu X, Lu H, Yang M-h. Chinese Optics Letters. 2013, 11: S10404

[3] Zhang X-k, Deng Z-y, Xu H-l. Chinese Optics Letters. 2013, 11: 090604

[4] Liu S-q, Ji Y-k, Yang J, Sun W, Li H. Sensors & Actuators A:Physical. 2018, 269: 312

[5] Fang G-c, Jia P-g, Liang T, Tian Q-l. Optics Communications. 2016, 371: 201

[6] Harith Z, Batumalay M, Irawati N. Optics. 2017, 144: 257

[7] Chai J, Liu Q, Liu J-x, Zhang D-d. Optical Fiber Technology. 2018, 41: 40

[8] Shao M, Zang Y, Qiao X, Fu H, Jia Z-a. IEEE Sensor Journal. 2017, 17: 1302

[9] Wang Y, Yang M-w, Wang DN. Optical Society America B. 2010, 27: 370

[10] Gong H, Wang DN. Optics Letters. 2015, 40: 3516

[11] Jiang L, Zhao L-j, Wang S-m, Yang J-p, Xiao H. Optics Express. 2011, 19: 17591

[12] Wang J-f, Liang H-h, Jin Y-x, Dong X-y, Jin S-z, Zhang Z-x. Journal of Optoelectronics · Laser. 2013, 24: 1037

[13] Huang C-l, Hsieh T-s, Wu C-w. Optics. 2018, 156: 696

[14] Ma Q-f, Tou Z-q, Ni K. Sensors & Actuators B: Chemical. 2018, 257: 800

[15] Wang Y-q, Shen C-y, Lou W-m, Shentu F-y. Optics Communications. 2016, 372: 229

[16] Chen M-c, Hsu C-l, Hsueh T-j. IEEE Electron Device Letters. 2014, 35: 590

[17] Su P-g, Chiou C-f. Sensors & Actuators B: Chemical. 2014, 200: 9

[18] Lin W-d, Chang H-m, Wu R-j. Sensors & Actuators B: Chemical. 2013, 181: 326

[19] Borini S, White R, Wei D, Astiey M, Haque S, Spigone E, Harris N, Kivioja J, Ryhanen T. Acs Nano. 2013, 7: 11166