Fiber-optic refractive-index sensors based on transmissive and reflective thin-core fiber modal interferometers

2010 ◽  
Vol 283 (10) ◽  
pp. 2136-2139 ◽  
Author(s):  
Tian-Hao Xia ◽  
A. Ping Zhang ◽  
Bobo Gu ◽  
Jing-Jing Zhu
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Core Fiber ◽  
Refractive Index Sensors

scholarly journals Fiber Optic Refractive Index Sensors Based on a Ball Resonator and Optical Backscatter Interrogation

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6199
Author(s):  
Madina Shaimerdenova ◽  
Takhmina Ayupova ◽  
Marzhan Sypabekova ◽  
Daniele Tosi
Keyword(s):  
Refractive Index ◽  
Reflection Spectrum ◽  
Return Loss ◽  
Fiber Optic ◽  
Single Mode ◽  
Wavelength Shift ◽  
Amplitude Change ◽  
Highly Sensitive ◽  
Refractive Index Sensors ◽  
Index Unit

In this work, we introduced fabrication and interrogation of simple and highly sensitive fiber-optic refractive index (RI) sensors based on ball resonators built on the tip of single-mode fibers. The probes have been fabricated through a CO2 fiber splicer, with a fast (~600 s) and repeatable method. The ball resonator acted as a weak interferometer with a return loss below −50 dB and was interrogated with an optical backscatter reflectometer measuring the reflection spectrum. The ball resonators behaved as weak interferometers with a shallow fringe and a spectrum that appeared close to a random signal, and RI sensitivity could be measured either through wavelength shift or amplitude change. In this work, we reported four samples having sensitivity ranges 48.9–403.3 nm/RIU and 256.0–566.2 dB/RIU (RIU = refractive index unit). Ball resonators appeared as a sensitive and robust platform for RI sensing in liquid and can be further functionalized for biosensing.

scholarly journals Spatial Frequency Multiplexing of Fiber-Optic Interferometric Refractive Index Sensors Based on Graded-Index Multimode Fibers

Sensors ◽  
2012 ◽  
Vol 12 (9) ◽  
pp. 12377-12385 ◽  
Author(s):  
Li Liu ◽  
Yuan Gong ◽  
Yu Wu ◽  
Tian Zhao ◽  
Hui-Juan Wu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Spatial Frequency ◽  
Fiber Optic ◽  
Multimode Fibers ◽  
Graded Index ◽  
Frequency Multiplexing ◽  
Refractive Index Sensors

scholarly journals Fiber optic refractive index sensors through spectral detection of Rayleigh backscattering in a chemically etched MgO-based nanoparticle-doped fiber

2018 ◽  
Vol 43 (24) ◽  
pp. 5945 ◽  
Author(s):  
Marzhan Sypabekova ◽  
Sanzhar Korganbayev ◽  
Wilfried Blanc ◽  
Takhmina Ayupova ◽  
Aliya Bekmurzayeva ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Rayleigh Backscattering ◽  
Spectral Detection ◽  
Refractive Index Sensors

Optimization for Closed-Loop Surface Plasmon Resonance Fiber-Optic Refractive Index Sensors Based on Tapered Probes

2015 ◽  
Vol 44 (2) ◽  
pp. 228001
Author(s):  
付丽辉 FU Li-hui ◽  
尹文庆 YIN Wen-qing ◽  
王马华 WANG Ma-hua ◽  
季仁东 JI Ren-dong ◽  
居勇峰 JU Yong-feng
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Closed Loop ◽  
Fiber Optic ◽  
Loop Surface ◽  
Refractive Index Sensors

scholarly journals Refractive Index Sensors Based on Long-Period Grating in a Negative Curvature Hollow-Core Fiber

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1803
Author(s):  
Hanna Izabela Stawska ◽  
Maciej Andrzej Popenda
Keyword(s):  
Refractive Index ◽  
Negative Curvature ◽  
Hollow Core ◽  
Long Period Grating ◽  
Fiber Gratings ◽  
Long Period ◽  
Analytical Formulas ◽  
Core Fiber ◽  
Refractive Index Sensors ◽  
Transmission Windows

Long-period optical fiber gratings (LPGs) are one of the widely used concepts for the sensing of refractive index (RI) changes. Negative curvature hollow-core fibers (NCHCFs), with their relatively large internal diameters that are easy to fill with liquids, appear as a very interesting medium to combine with the idea of LPGs and use for RI sensing. However, to date, there has been no investigation of the RI sensing capabilities of the NCHCF-based LPGs. The results presented in the paper do not only address this matter, but also compare the RI sensitivities of the NCHCFs alone and the gratings. By modeling two revolver-type fibers, with their internal diameters reflecting the results of the possible LPG-inscription process, the authors show that the fibers’ transmission windows shift in response to the RI change, resulting in changes in RI sensitivities as high as −4411 nm/RIU. On the contrary, the shift in the transmission dip of the NCHCF-based LPGs corresponds to a sensitivity of −658 nm/RIU. A general confirmation of these results was ensured by comparing the analytical formulas describing the sensitivities of the NCHCFs and the NCHCF-based LPGs.

Expermental Studies of Multimode Interference Based Fiber Optic Refractive Index Sensors

2010 ◽  
Vol 37 (6) ◽  
pp. 1516-1519 ◽  
Author(s):  
赵宇 Zhao Yu ◽  
金永兴 Jin Yongxing ◽  
董新永 Dong Xinyong ◽  
王剑锋 Wang Jianfeng
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Multimode Interference ◽  
Refractive Index Sensors

scholarly journals A Highly Sensitive Fiber Optic Sensor Based on Two-Core Fiber for Refractive Index Measurement

Sensors ◽  
2013 ◽  
Vol 13 (10) ◽  
pp. 14200-14213 ◽  
Author(s):  
José Guzmán-Sepúlveda ◽  
Rafael Guzmán-Cabrera ◽  
Miguel Torres-Cisneros ◽  
José Sánchez-Mondragón ◽  
Daniel May-Arrioja
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Refractive Index Measurement ◽  
Optic Sensor ◽  
Index Measurement ◽  
Highly Sensitive ◽  
Core Fiber
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