期刊
OPTICS LETTERS
卷 40, 期 17, 页码 3994-3997出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.40.003994
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资金
- Fundamental Research Funds for the Central Universities of China [3102014JCQ01099, 3102014JCQ01101]
- National Natural Science Foundation of China (NSFC) [11404263, 11404264, 61275105, 61405161]
We propose and experimentally demonstrate a method to significantly extend the sensitive window of tilted fiber-Bragg grating (TFBG) into low-refractive-index region with the integration of graphene coating. The coupling between cladding modes of TFBG and graphene coating results in an obvious modification of the cladding-mode envelope, which provides a sensitive regime relying on graphene's complex refractive index. Interacting the graphene-coated TFBG with various aqueous solutions, we observe strongly enhanced sensitivity in the low-refractive-index region of 1-1.428, which is about 10-fold extended from that of the unloaded TFBG. The graphene-coated TFBGs present great potentials in the biochemical sensing window. (C) 2015 Optical Society of America
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