Influence of InGaZnO Films with Different Ratios on Refractive Index Sensing Characteristics of LPFG

• Main Authors: Huanhuan Yan, Li Wang, Shufeng Li, Huisong Zhang, Jin Wang, Peng Cheng
• Format: Article
• Language: English
• Published: MDPI AG 2020-10-01
• Series: Coatings
• Subjects: refractive index sensing; InGaZnO nanofilm; LPFG; PLD
• Online Access: https://www.mdpi.com/2079-6412/10/10/978

Sensitive materials are widely used in the field of optical fiber sensing because of their unique advantages such as rich types, controllable composition ratio and diverse structure distribution. In this paper, the surface of long-period fiber gratings with InGaZnO [(In₂O₃):(Ga₂O₃):(ZnO)] nano films with different compositions were coated by pulse laser deposition (PLD) technology. The best sensing ratio and the high sensitivity sensing of the refractive index of long-period fiber grating (LPFG) were achieved through the analysis of the influence of different ratios of InGaZnO nano films on the refractive index sensing characteristics of grating. High sensitivities of 337 nm/RIU (refractive index unit) and 145 dB/RIU of the LPFG are achieved when the best doping ratio of InGaZnO is 7:1:2.