Femtosecond laser line-by-line tilted Bragg grating inscription in single-mode step-index TOPAS/ZEONEX polymer optical fiber. Qu, H., Chen, Z., Gao, S., Min, R., Woyessa, G., Bang, O., Wang, H., Caucheteur, C., & Hu, X. Optics Letters, Optica Publishing Group (formerly OSA), 15 March 2023.
Femtosecond laser line-by-line tilted Bragg grating inscription in single-mode step-index TOPAS/ZEONEX polymer optical fiber. [link]Paper  doi  abstract   bibtex   
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.
@article{ORBi-b965a0f5-79b8-438f-a36e-3f1eaf8a9fb4,
	AUTHOR = {Qu, Hang and Chen, Zhen and Gao, Shixin and Min, Rui and Woyessa, Getinet and Bang, Ole and Wang, Heng and Caucheteur, Christophe and Hu, Xuehao},
	TITLE = {Femtosecond laser line-by-line tilted Bragg grating inscription in single-mode step-index TOPAS/ZEONEX polymer optical fiber.},
	LANGUAGE = {English},
	YEAR = {15 March 2023},
	DOI = {10.1364/OL.482598},
	PUBLISHER = {Optica Publishing Group (formerly OSA)},
	JOURNAL = {Optics Letters},
	ISSN = {0146-9592},
	VOLUME = {48},
	NUMBER = {6},
	ABSTRACT = {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.},
	ORGANIZATION = {Fonds De La Recherche Scientifique - FNRS},
	URL = {https://opg.optica.org/viewmedia.cfm?URI=ol-48-6-1438&seq=0}
}

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