1. Spectral Characteristics of Fiber-Based S-Shape Taper Refractometer With High Sensitivity
- Author
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Shun Wu, Xuemei Yang, Haihao Cheng, Shun Wang, Jianwen Ma, Yongqi Li, and Songyang Zhang
- Subjects
Materials science ,Modal interference ,business.industry ,Cladding mode ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Optics ,Transmission (telecommunications) ,Refractometer ,Interference (communication) ,Fiber ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,business ,Refractive index - Abstract
In this work, we have experimentally demonstrated the refractive index (RI) sensing characteristics of a S-shape taper refractometer (STR) based on modal interference theory. Our preliminary theoretical analysis reveals that there exists a critical cladding mode, which is essential for understanding the sensing characteristics. When the dominant cladding mode involved in a core-cladding interference is close to the critical cladding mode, the resulting RI sensitivity tends to reach a maximum value. Moreover, both the critical and the dominant cladding mode are dependent on ambient RI. Our sensor achieves a high RI sensitivity of 2109.7 nm/RIU for a transmission dip at around 1505 nm with a measurement range of 1.36 to 1.39.
- Published
- 2021