# Analysis of a Photonic Crystal Fiber Sensor with Reuleaux Triangle

Bing, Pibin;Huang, Shichao;Guo, Xinyue;Zhang, Hongtao;Tan, Lian;Li, Zhongyang;Yao, Jianquan

• Received : 2018.12.04
• Accepted : 2019.05.08
• Published : 2019.06.25
• 14 2

#### Abstract

The characteristics of a photonic crystal fiber sensor with reuleaux triangle are studied by using the finite element method. The wavelength sensitivity of the designed optical fiber sensor is related to the arc radius of the reuleaux triangle. Whether the core area is solid or liquid as well as the refractive index of the liquid core contributes to wavelength sensitivity. The simulation results show that larger arc radius leads to higher sensitivity. The sensitivity can be improved by introducing a liquid core, and higher wavelength sensitivity can be achieved with a lower refractive index liquid core. In addition, the specific channel plated with gold film is polished and then analyte is deposited on the film surface, in which case the position of the resonance peak is the same as that of the complete photonic crystal fiber with three analyte channels being filled with analyte. This means that filling process becomes convenient with equivalent performance of designed sensor. The maximum wavelength sensitivity of the sensor is 10200 nm/RIU and the resolution is $9.8{\times}10^{-6}RIU$.

#### Keywords

Photonic crystal fiber;Wavelength sensitivity;Liquid core

#### Acknowledgement

Supported by : National Natural Science Foundation of China