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[The experiment research on solution refractive index sensor based on tilted fiber Bragg grating].
Qi Jiang1, Dan-Dan Lü2, Ming-Hao Yu2
1School of Control Science and Engineering, Shandong University, Ji'nan 250061, China jiangqi@sdu.edu.cn
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|March 12, 2014
Summary
This study demonstrates that coating a tilted fiber Bragg grating (TFBG) with nanoscale gold enhances its refractive index (RI) sensing capabilities. The gold-coated TFBG shows a dramatic increase in RI sensitivity, improving detection by 200 to 300 times compared to the bare TFBG.
Area of Science:
- Photonics and optical sensing technologies.
- Nanomaterials and surface science.
- Fiber optic sensor development.
Context:
- Tilted fiber Bragg gratings (TFBGs) are utilized for sensing applications.
- Surface Plasmon Resonance (SPR) offers high sensitivity for refractive index (RI) detection.
- Combining TFBGs with nanomaterials can potentially enhance sensing performance.
Purpose:
- To investigate the RI sensing performance of a bare TFBG and a gold-coated TFBG.
- To compare the sensitivity and linearity of both sensor configurations.
- To analyze the effect of nanoscale gold coating on TFBG-based SPR sensing.
Summary:
- Simulations and experiments were conducted on bare and gold-coated TFBGs for RI sensing.
- Both sensor types showed a linear relationship between cladding mode shifts and solution refractive index (SRI).
- The gold-coated TFBG exhibited significantly enhanced RI sensitivity, reaching 500 nm/RIU, which is 200-300 times greater than the bare TFBG.
Impact:
- The developed gold-coated TFBG SPR sensor demonstrates a substantial improvement in refractive index sensitivity.
- This enhanced sensitivity opens possibilities for more precise and sensitive chemical and biological detection.
- The high linearity (R² > 0.99) ensures reliable and accurate measurements in sensing applications.
