Refractometer probe based on a reflective carbon nanotube-modified microfiber Bragg grating

Biqiang Jiang*, Meng Xue, Chenyang Zhao, Dong Mao, Kaiming Zhou, Lin Zhang, Jianlin Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A carbon nanotube (CNT)-modified microfiber Bragg grating (MFBG) is proposed to measure the refractive index with a strong enhancement of the sensitivity in the low refractive index region. The introduction of the CNT layer influences the evanescent field of the MFBG and causes modification of the reflection spectrum. With the increase of the surrounding refractive index (SRI), we observe significant attenuation to the peak of the Bragg resonance, while its wavelength remains almost unchanged. Our detailed experimental results disclose that the CNT-MFBG demonstrates strong sensitivity in the low refractive index range of 1.333-1.435, with peak intensity up to -53.4 dBm/refractive index unit, which is 15-folds higher than that of the uncoated MFBG. Therefore, taking advantage of the CNT-induced evanescent field enhancement, the reflective MFBG probe presents strong sensing capability in biochemical fields.

Original languageEnglish
Pages (from-to)7037-7041
Number of pages5
JournalApplied Optics
Issue number25
Early online date29 Aug 2016
Publication statusPublished - 1 Sept 2016

Bibliographical note

© 2016 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.

Funding: NSFC (61505165, 61405161, 11404263); Natural Science Basic Research Plan in Shaanxi Province of China (2016JQ6032); Marie Skłodowska-Curie Individual Fellowships in EU Horizon 2020 (660648).


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