Refractive Index Detection With a Laser-Induced Graphene-Coated Tilted Fiber Bragg Grating and Spectral Profile Interrogation
Nurlankyzy M. Pereira L. Zhakypbekova A. Bekmurzayeva A. Ashikbayeva Z. Ioannou A. Kalli K. Costa F.M. Santos N. Marques C. Tosi D.
2025Institute of Electrical and Electronics Engineers Inc.
IEEE Sensors Letters
2025#9Issue 9
In this letter, we report a tilted fiber Bragg grating (TFBG) with a laser-induced graphene coating. The device displays a cladding mode pattern with a bandwidth of 44 nm. Each spectral dip and peak senses the refractive index change, with sensitivities up to 9.62 dB/refractive index units (RIUs) and 4.00 dB/RIU, respectively. The interrogation of the whole spectral feature envelope can be performed either in the wavelength or in the amplitude domain, with sensitivities of 11.21 nm/RIU and 7.15 dB/RIU, respectively. The graphene-coated TFBG provides improved sensitivity over a standard TFBG with a simple fabrication process and does not require additional components (such as polarizers or intensity-modulating devices) or fiber manipulations (such as etching, tapering, or capillaries). The achieved precision of up to 4.17 × 10-4 RIU is compatible with refractometry and biosensing applications.
biosensing , Electromagnetic wave sensors , fiber optic sensors , refractive index (RI) , tilted fiber Bragg grating (TFBG)
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Laboratory of Biosensors and Bioinstruments, National Laboratory Astana, Astana, 010000, Kazakhstan
Nazarbayev University, School of Engineering and Digital Sciences, Astana, 010000, Kazakhstan
University of Aveiro, CICECO—Aveiro Institute of Materials, Department of Physics, Aveiro, 3810-193, Portugal
School of Sciences and Humanities, Astana, 010000, Kazakhstan
Cyprus University of Technology, Photonics and Optical Sensors Research Laboratory, Limassol, Cyprus
University of Aveiro, i3N, Department of Physics, Aveiro, 3810-193, Portugal
VSB—Technical University of Ostrava, Department of Physics, Faculty of Electrical Engineering and Computer Science, Ostrava, Czech Republic
Laboratory of Biosensors and Bioinstruments
Nazarbayev University
University of Aveiro
School of Sciences and Humanities
Cyprus University of Technology
University of Aveiro
VSB—Technical University of Ostrava
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