High temperature nano-coated electric-arc-induced long-period gratings working at the dispersion turning point for refractive index sensing

2014 ◽  
Vol 53 (8S2) ◽  
pp. 08ME01 ◽  
Author(s):  
Anna K. Debowska ◽  
Mateusz Smietana ◽  
Predrag Mikulic ◽  
Wojtek J. Bock
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Turning Point ◽  
Electric Arc ◽  
Long Period ◽  
Refractive Index Sensing ◽  
Long Period Gratings

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.

scholarly journals Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al2O3 Overlays

Sensors ◽  
2013 ◽  
Vol 13 (12) ◽  
pp. 16372-16383 ◽  
Author(s):  
Mateusz Śmietana ◽  
Marcin Myśliwiec ◽  
Predrag Mikulic ◽  
Bartłomiej Witkowski ◽  
Wojtek Bock
Keyword(s):  
Refractive Index ◽  
Atomic Layer ◽  
Fine Tuning ◽  
Sensing Properties ◽  
Long Period ◽  
Refractive Index Sensing ◽  
Long Period Gratings
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