Shallow-tapered chirped fiber bragg grating sensors for dual refractive index and temperature sensing
Ayupova T. Shaimerdenova M. Tosi D.
1 June 2021MDPI AG
Sensors
2021#21Issue 11
In this work, we present a gold-coated shallow-tapered chirped fiber Bragg grating (stCFBG) for dual refractive index (RI) and temperature sensing. The stCFBG has been fabricated on a 15-mm long chirped FBG, by tapering a 7.29-mm region with a waist of 39 µm. The spectral analysis shows two distinct regions: a pre-taper region, in which the stCFBG is RI-independent and can be used to detect thermal changes, and a post-taper region, in which the reflectivity increases significantly when the RI increments. We estimate the RI and thermal sensitivities as 382.83 dB/RIU and 9.893 pm/◦C, respectively. The cross-talk values are low (−1.54 × 10−3 dB/◦C and 568.1 pm/RIU), which allows an almost ideal separation between RI and thermal characteristics. The stCFBG is a compact probe, suitable for long-term and temperature-compensated biosensing and detection of chemical analytes.
Chirped fiber Bragg grating , Dual sensing , Fiber Bragg gratings , Fiber tapers , Optical fiber sensors , Refractive index sensor
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School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Laboratory of Biosensors and Bioinstruments, National Laboratory Astana, Nur-Sultan, 010000, Kazakhstan
School of Engineering and Digital Sciences
Laboratory of Biosensors and Bioinstruments
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