Ultrasensitive measurement of gas refractive index using an optical nanofiber coupler

• Main Authors: Li, Kaiwei, Zhang, Nan, Zhang, Nancy Meng Ying, Liu, Guigen, Zhang, Ting, Wei, Lei
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2019
• Subjects: Fiber Optics; Fiber Optics Sensors; DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/90143; http://hdl.handle.net/10220/48409
• Institution: Nanyang Technological University

We report an ultrasensitive gas refractive index (RI) sensor based on optical nanofiber couplers (ONCs). Theoretical analysis reveals that a dispersion turning point (DTP) exists when the diameter of the coupler is below 1000 nm. Leveraging this DTP, the gas RI sensitivity can be significantly impro...