scholarly journals Optical Fibre Long-Period Grating Sensors Operating at and around the Phase Matching Turning Point

2019 ◽  
Author(s):  
Rebecca Yen-Ni Wong ◽  
Dora Hu Juan Juan ◽  
Morten Ibsen ◽  
Perry Ping Shum
Keyword(s):  
Optical Fibre ◽  
Turning Point ◽  
Phase Matching ◽  
Long Period Grating ◽  
Long Period

scholarly journals Sensitivity Characterization of Cascaded Long-Period Gratings Operating near the Phase-Matching Turning Point

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5978
Author(s):  
Wei Zhou ◽  
Yanli Ran ◽  
Zhijun Yan ◽  
Qizhen Sun ◽  
Chen Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Temperature Sensitivity ◽  
Turning Point ◽  
Phase Matching ◽  
Long Period ◽  
Long Period Gratings ◽  
High Measurement ◽  
Surrounding Refractive Index ◽  
Wavelength Resolution ◽  
Quality Factor Q

We characterized a cascaded long-period gratings (LPGs)-based sensor that was operating at the phase-matching turning point (PMTP). The cascaded LPGs constructed an in-fiber Mach–Zehnder interferometer (MZI), which exhibited a series of high-quality-factor (Q) narrow-bandwidth resonance peaks. As the LPG operated at the PMTP, the proposed sensor showed an ultrahigh refractive index (RI) and temperature sensitivity, and high measurement precision. In this study, we took an in-depth look at the effects of grating separation on Q-factor and sensitivity. The results showed that the sensitivity to the surrounding refractive index (SRI) reached 4741.5 nm/RIU at 1.4255 and 2138 nm/RIU, over the range of 1.335–1.373. In addition, the temperature sensitivity was around 4.84 nm/°C. With a 0.02 nm wavelength resolution, the RI and temperature sensing limits were 9.3 × 10−6 RIU and 5.5 × 10−3 °C.

Optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water

2012 ◽  
Vol 133 (2-3) ◽  
pp. 784-792 ◽  
Author(s):  
Sergiy Korposh ◽  
Roman Selyanchyn ◽  
Wataru Yasukochi ◽  
Seung-Woo Lee ◽  
Stephen W. James ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Optical Fibre ◽  
Long Period Grating ◽  
Ammonia Sensing ◽  
Long Period

scholarly journals Highly sensitive optical fibre long period grating biosensor anchored with silica core gold shell nanoparticles

2016 ◽  
Vol 75 ◽  
pp. 222-231 ◽  
Author(s):  
L. Marques ◽  
F.U. Hernandez ◽  
S.W. James ◽  
S.P. Morgan ◽  
M. Clark ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Long Period Grating ◽  
Shell Nanoparticles ◽  
Gold Shell ◽  
Long Period ◽  
Highly Sensitive ◽  
Silica Core
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