Abstract
The development of excessively tilted fiber gratings (Ex-TFGs) provides a new type of sensing device with high refractive index (RI) sensitivity, low thermal crosstalk and vector sensing property. Due to the asymmetric grating structure of Ex-TFG, the light in the core is coupled into high order forward-propagating cladding modes and split into two orthogonal polarization states, resulting in dual-peak resonances in the transmission spectrum. The Ex-TFG also exhibits a non-circularly symmetrical near field distribution, which endows an exceptional orientation sensing capability. Benefitting from the unique mode coupling behavior, Ex-TFGs have been studied and developed for many different sensing applications, such as polarization dependent torsion and loading sensors, vector accelerometer and magnetometer, and a variety of low thermal crosstalk bio/chemical sensors. This paper will review the recent study and development of Ex-TFGs in terms of mode coupling mechanism, fabrication method, transmission and sensor characteristics and the novel applications in sensing areas.
| Original language | English |
|---|---|
| Article number | 9337919 |
| Pages (from-to) | 3761-3770 |
| Number of pages | 10 |
| Journal | Journal of Lightwave Technology |
| Volume | 39 |
| Issue number | 12 |
| Early online date | 28 Jan 2021 |
| DOIs | |
| Publication status | Published - 15 Jun 2021 |
Bibliographical note
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- Optical fiber grating
- biosensing
- mode coupling in excessively asymmetric structure
- orientation sensing
- refractive index sensing