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.

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 Highly Sensitive, Polarization Maintaining Photonic Crystal Fiber Sensor Operating in the THz Regime

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 40 ◽  
Author(s):  
Sohel Rana ◽  
Nirmala Kandadai ◽  
Harish Subbaraman
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
High Sensitivity ◽  
Relative Sensitivity ◽  
Computational Technique ◽  
The Finite Element Method ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Highly Sensitive ◽  
Imaging And Spectroscopy

In this paper, a high sensitivity, polarization preserving photonic crystal fiber (PCF), based on circular air holes for sensing in the terahertz (THz) band, is presented. The finite element method, a practical and precise computational technique for describing the interactions between light and matter, is used to compute the modal properties of the designed fiber. For the designed PCF, comprising of circular air holes in both the cladding and in the porous core, a relative sensitivity of 73.5% and a high birefringence of 0.013 are achieved at 1.6 THz. The all circular air-hole structure, owing to its simplicity and compatibility with the current fiber draw technique for PCF fabrication, can be realized practically. It is anticipated that the designed fiber can be employed in applications such as detection of biological samples and toxic chemicals, imaging, and spectroscopy.

Comparative study of the highly sensitive plasmonic sensor based on a D-Shaped photonic crystal fiber with silver or gold layers

2021 ◽  
Author(s):  
Bahar Meshginqalam ◽  
Jamal Barvestani
Keyword(s):  
Photonic Crystal ◽  
Comparative Study ◽  
Photonic Crystal Fiber ◽  
Structural Parameters ◽  
Simultaneous Detection ◽  
Plasmonic Sensor ◽  
Plasmonic Material ◽  
Sensor Performance ◽  
Crystal Fiber ◽  
Highly Sensitive

Abstract A highly sensitive D-shaped photonic crystal fiber sensor with circular lattice is proposed for external plasmonic sensing. The proposed design of plasmonic material in a D-shaped form effectively facilitates the excitation of surface plasmons and enhances the sensor performance. As a comparative study, two different plasmonic materials, gold and silver, are applied D-shapely on the fiber and the proposed sensor performance is numerically investigated and evaluated. Moreover, the optimized structural parameters such as air-hole diameters and the thickness of silver and gold layers are selected via simulation results which cause the highest sensitivity of 40000nm/RIU for the gold coated fiber using the wavelength interrogation method. Furthermore, the maximum figure of merit can reach 621.50RIU-1. Analytes with the refractive indices ranging from 1.34 to 1.39 can be detected by double-loss peak that is a more reliable method of simultaneous detection and verification of sensing characteristics. Due to its promising results, the proposed sensor can be widely useful in the area of chemical and biological sensing.

scholarly journals Design of Broadband Dispersion Compensating Photonic Crystal Fiber

2012 ◽  
Vol 1 (4) ◽  
pp. 384 ◽  
Author(s):  
Md. Selim Habib ◽  
Md. Samiul Habib ◽  
S.M.A Razzak ◽  
M.A.G Khan
Keyword(s):  
Finite Element Method ◽  
Boundary Condition ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Dispersion Coefficient ◽  
Dispersion Compensation ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Crystal Fiber ◽  
Compensation Ratio

This paper presents a triangular-lattice photonic crystal fiber for broadband dispersion compensation. The finite element method with perfectly matched absorbing layers boundary condition is used to investigate the guiding properties. The designed dispersion compensating fiber shows that it is possible to obtain a larger negative dispersion coefficient of ?360 ps/(nm.km) at 1.55 ?m, better dispersion slope compensation, better compensation ratio in the entire telecommunication (1460-1640 nm) band by using a modest number of design parameters and very simple cladding design.

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