High Birefringence D-Shaped Germanium-Doped Photonic Crystal Fiber Sensor

Micromachines

Bo Huang¹  Jin Liu¹  Qianhe Zhao¹  Haishan Liu¹  Guohui Zeng¹  Haima Yang² 

[1] School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;

关键词: fiber optic sensor;    surface plasmon resonance;    finite element method;    birefringence;   

DOI  :  10.3390/mi13060826

来源: DOAJ

【 摘 要 】

In this work, a surface plasmon resonance (SPR) sensor based on a D-shaped germanium-doped photonic crystal fiber (PCF) is proposed. The finite element method (FEM) is introduced to analyze the structure parameters, such as germanium-doped concentration, lattice pitch, and air hole size. In addition, the coupling properties and birefringence properties of PCF are also studied. The computer simulation results indicate that two different surface plasmon polariton (SPP) coupling modes are produced on the polished surface, covered with metal film, when the analyte refractive index (RI) is $1.34$. Then, with the increase of the RI, the incompleteness of one of the coupling modes will be transformed into the complete coupling. The effect of germanium concentration on the birefringence is also analyzed. It has an optimal wavelength sensitivity of 5600 nm/RIU when the RI is 1.37. This sensor exhibits a maximum birefringence of 1.06 × 10⁻² and a resolution of 1.78 × 10⁻⁵ RIU with high linearity.

【 授权许可】

Unknown