Temperature-compensated refractive index sensing with high sensitivity using hybrid fiber grating

2019 ◽  
Author(s):  
Xiaojun Fan ◽  
Junfeng Jiang ◽  
Xuezhi Zhang ◽  
Kun Liu ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Fiber Grating ◽  
Hybrid Fiber ◽  
Refractive Index Sensing

scholarly journals Influence of InGaZnO Films with Different Ratios on Refractive Index Sensing Characteristics of LPFG

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 978
Author(s):  
Huanhuan Yan ◽  
Li Wang ◽  
Shufeng Li ◽  
Huisong Zhang ◽  
Jin Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Fiber Grating ◽  
Fiber Gratings ◽  
Long Period ◽  
Refractive Index Sensing ◽  
Long Period Fiber Gratings ◽  
Optical Fiber Sensing ◽  
Period Fiber Grating ◽  
Sensing Characteristics

Sensitive materials are widely used in the field of optical fiber sensing because of their unique advantages such as rich types, controllable composition ratio and diverse structure distribution. In this paper, the surface of long-period fiber gratings with InGaZnO [(In2O3):(Ga2O3):(ZnO)] nano films with different compositions were coated by pulse laser deposition (PLD) technology. The best sensing ratio and the high sensitivity sensing of the refractive index of long-period fiber grating (LPFG) were achieved through the analysis of the influence of different ratios of InGaZnO nano films on the refractive index sensing characteristics of grating. High sensitivities of 337 nm/RIU (refractive index unit) and 145 dB/RIU of the LPFG are achieved when the best doping ratio of InGaZnO is 7:1:2.

scholarly journals Hybrid Grating in Reduced-Diameter Fiber for Temperature-Calibrated High-Sensitivity Refractive Index Sensing

2019 ◽  
Vol 9 (9) ◽  
pp. 1923
Author(s):  
Biqiang Jiang ◽  
Zhen Hao ◽  
Dingyi Feng ◽  
Kaiming Zhou ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Surrounding Medium ◽  
High Sensitivity ◽  
Fiber Grating ◽  
Bragg Resonance ◽  
Core Mode ◽  
Promising Alternative ◽  
Sensing Applications ◽  
Highly Sensitive

We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG’s Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium’s refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water’s RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

scholarly journals Refractive Index Sensing through Surface Plasmon Resonance in Light-Diffusing Fibers

2018 ◽  
Vol 8 (7) ◽  
pp. 1172 ◽  
Author(s):  
Nunzio Cennamo ◽  
Luigi Zeni ◽  
Ester Catalano ◽  
Francesco Arcadio ◽  
Aldo Minardo
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Optical Fiber Sensor ◽  
Fiber Surface ◽  
High Sensitivity ◽  
Refractive Index Sensing ◽  
Sensor Platform ◽  
Chemical Procedure

In this paper, we show that light-diffusing fibers (LDF) can be efficiently used as host material for surface plasmon resonance (SPR)-based refractive index sensing. This novel platform does not require a chemical procedure to remove the cladding or enhance the evanescent field, which is expected to give better reproducibility of the sensing interface. The SPR sensor has been realized by first removing the cladding with a simple mechanical stripper, and then covering the unclad fiber surface with a thin gold film. The tests have been carried out using water–glycerin mixtures with refractive indices ranging from 1.332 to 1.394. The experimental results reveal a high sensitivity of the SPR wavelength to the outer medium’s refractive index, with values ranging from ~1500 to ~4000 nm/RIU in the analyzed range. The results suggest that the proposed optical fiber sensor platform could be used in biochemical applications.

scholarly journals Multi-slot photonic crystal cavities for high-sensitivity refractive index sensing

2019 ◽  
Vol 27 (3) ◽  
pp. 3609 ◽  
Author(s):  
Peipeng Xu ◽  
Jiajiu Zheng ◽  
Jun Zhou ◽  
Yueyang Chen ◽  
Chen Zou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
High Sensitivity ◽  
Photonic Crystal Cavities ◽  
Refractive Index Sensing

High sensitivity and FOM refractive index sensing based on Fano resonance in all-grating racetrack resonators

2019 ◽  
Vol 446 ◽  
pp. 141-146 ◽  
Author(s):  
Yongjiao Wen ◽  
Yu Sun ◽  
Chunyu Deng ◽  
Lei Huang ◽  
Guohua Hu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fano Resonance ◽  
High Sensitivity ◽  
Refractive Index Sensing

Temperature-insensitive Refractive Index Sensing Based on W-type Fiber Grating

2017 ◽  
Author(s):  
Junjie Xie ◽  
Binbin Yan ◽  
Yanhua Luo ◽  
Haifeng Qi ◽  
Liwei Yang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Grating ◽  
Refractive Index Sensing ◽  
Type Fiber
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