Refractive index and temperature dual parameter sensor based on twin-core photonic crystal fiber

2021 ◽  
Author(s):  
zhiyong yin ◽  
Xili Jing ◽  
Yuhui Feng ◽  
Zhigang Gao ◽  
Biao Wu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Gold Film ◽  
Structural Parameters ◽  
High Sensitivity ◽  
Mutual Interference ◽  
Crystal Fiber ◽  
Spr Sensor ◽  
Sensing Characteristics

Abstract A twin-core photonic crystal fiber sensor is proposed for measuring liquid refractive index (RI) and temperature simultaneously. The air holes of the sensor are arranged in a hexagonal pattern, and two planes are introduced by polishing in the cladding. On one side of the plane, the gold film is deposited for RI measurement, and on the other side, the gold film and polydimethylsiloxane (PDMS) are deposited for temperature measurement. We analyzed its sensing characteristics by using finite element method. The numerical results show that the two channels for measuring RI and temperature have no mutual interference. It reduces the complexity of the sensing measurement. The maximum spectral sensitivity of the sensor is 20000 nm/RIU and 9.2 nm/℃, respectively, when the liquid RI is in the range of 1.36-1.42 and the temperature is in the range of 0-50 ℃. The results also show the sensing accuracy was not very sensitive to the change of structural parameters. It hence makes the sensor be easy to fabricate. Our work is very helpful for implementation of a high sensitivity, easy fabrication and real-time multi-parameter SPR sensor.

scholarly journals A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1009 ◽  
Author(s):  
Haixia Han ◽  
Donglian Hou ◽  
Lei Zhao ◽  
Nannan Luan ◽  
Li Song ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Direct Contact ◽  
Gold Film ◽  
Fiber Material ◽  
The Finite Element Method ◽  
Plasmonic Sensor ◽  
Detection Range ◽  
Crystal Fiber ◽  
Spr Sensor

An H-shaped photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor is proposed for detecting large refractive index (RI) range which can either be higher or lower than the RI of the fiber material used. The grooves of the H-shaped PCF as the sensing channels are coated with gold film and then brought into direct contact with the analyte, which not only reduces the complexity of the fabrication but also provides reusable capacity compared with other designs. The sensing performance of the proposed sensor is investigated by using the finite element method. Numerical results show that the sensor can work normally in the large analyte RI (na) range from 1.33 to 1.49, and reach the maximum sensitivity of 25,900 nm/RIU (RI units) at the na range 1.47–1.48. Moreover, the sensor shows good stability in the tolerances of ±10% of the gold-film thickness.

scholarly journals High Sensitivity Photonic Crystal Fiber Refractive Index Sensor with Gold Coated Externally Based on Surface Plasmon Resonance

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 640 ◽  
Author(s):  
Xudong Li ◽  
Shuguang Li ◽  
Xin Yan ◽  
Dongming Sun ◽  
Zheng Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
High Sensitivity ◽  
Refractive Index Sensor ◽  
Crystal Fiber ◽  
Air Hole

In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU−1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.

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