Abstract
We demonstrate here an extremely simple, compact and robust RI probe sensor based on a femtosecond-laser induced refractive-index-modified-dot (RIMD) fabricated near the end face of a single mode fiber. The RIMD and the fiber end face form a Fabry-Perot interferometer, which is highly sensitive to surrounding RI. The fabrication process of the RIMD involves only one step and takes ~0.1s, which is extremely short compared with other techniques. The proposed sensor exhibits an ultra-high sensitivity of ~2523.2 dB/RIU at an RI of 1.435, which is 1-2 orders of magnitude higher than that of the existing intensity-modulated RI sensors. Moreover, the proposed sensor has the distinct advantages of compact size (~50 µm), easy fabrication and no temperature cross-sensitivity. The advantages of the device make it a promising candidate for applications in designing highly sensitive sensors in biochemical and environmental measurement field.
| Original language | English |
|---|---|
| Pages (from-to) | 1157-1160 |
| Number of pages | 4 |
| Journal | Optics Letters |
| Volume | 42 |
| Issue number | 6 |
| Early online date | 13 Mar 2017 |
| DOIs | |
| Publication status | Published - 15 Mar 2017 |
Bibliographical note
© 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.Keywords
- fiber optics sensors
- microstructure fabrication
- interferometry
- Fabry-Perot
- all-optical devices