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Shallow-Tapered Chirped Fiber Bragg Grating Sensors for Dual Refractive Index and Temperature Sensing
| Content Provider | MDPI |
|---|---|
| Author | Ayupova, Takhmina Shaimerdenova, Madina Tosi, Daniele |
| Copyright Year | 2021 |
| Description | 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. |
| Starting Page | 3635 |
| e-ISSN | 14248220 |
| DOI | 10.3390/s21113635 |
| Journal | Sensors |
| Issue Number | 11 |
| Volume Number | 21 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-05-24 |
| Access Restriction | Open |
| Subject Keyword | Sensors Telecommunications Optical Fiber Sensors Fiber Tapers Fiber Bragg Gratings Chirped Fiber Bragg Grating Refractive Index Sensor Dual Sensing |
| Content Type | Text |
| Resource Type | Article |
