[en] In this Letter, we demonstrate 8°-tilted fiber Bragg grating (TFBG) inscription in single-mode step-index TOPAS/ZEONEX polymer optical fibers (POFs) using a 520 nm femtosecond laser and the line-by-line (LbL) writing technique. As a result of the tilt angle and the fiber refractive index, a large spectral range of cladding mode resonances covering 147 nm is obtained. The evolution of the transmitted spectrum is analyzed as a function of the surrounding refractive index (SRI) in a large range from 1.30 to 1.50. The cutoff cladding mode shows a refractive index sensitivity of 507 nm/RIU (refractive index unit). For single-resonance tracking near the cutoff mode, the sensitivity is at least 6 nm/RIU, depending on the exact wavelength position of the cladding modes. The main originality of our work is that it produces, for the first time, to the best of our knowledge, a TFBG in POF that operates in the refractive index range of aqueous solutions. The sensing capability for a large range of refractive index values is also relevant for (bio)chemical sensing in different media.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Qu, Hang; Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou, China
Chen, Zhen; Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou, China
Gao, Shixin; College of Science, Shenyang Aerospace University, Shenyang, China
Min, Rui; Center for Cognition and Neuroergonomics, State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Zhuhai, China
Woyessa, Getinet ; DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Lyngby, Denmark
Bang, Ole ; DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Lyngby, Denmark
Wang, Heng; College of Science, Shenyang Aerospace University, Shenyang, China
Caucheteur, Christophe ; Université de Mons - UMONS > Faculté Polytechniqu > Service d'Electromagnétisme et Télécommunications
Hu, Xuehao ; Université de Mons - UMONS > Recherche > Service ERC Unit - Advanced Photonic
Research Institute for Materials Science and Engineering
Funders :
Special Projects in Key Fields of Colleges and Universities in Guangdong Province Science and Technology Department of Guangdong Province Fonds De La Recherche Scientifique - FNRS
Funding text :
Funding. Special Projects in Key Fields of Colleges and Universities in Guangdong Province (2020ZDZX3037); Science and Technology Department of Guangdong Province (2022A1515012571); Fonds De La Recherche Scientifique - FNRS.Acknowledgments. Funding from Fonds de la Recherche Scientifique (F.R.S.-FNRS) is under the Postdoctoral Researcher grant (Chargé de Recherches) of Xuehao Hu and the Senior Research Associate Position of Christophe Caucheteur
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