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Title: Perfluorinated fiber material properties following femtosecond laser inscription
Authors: Leal-Junior, Arnaldo 
Theodosiou, Antreas 
Fernandes, António José S. 
Frizera, Anselmo 
Kalli, Kyriacos 
Marques, Carlos Alberto F. 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Polymer optical fibers;Optical materials;Femtosecond laser inscription
Issue Date: Nov-2020
Source: Optical Materials, 2020, vol. 109, articl. no. 110412
Volume: 109
Journal: Optical Materials 
Abstract: This paper presents the materials analysis and comparison of fiber gratings inscribed using the plane-by-plane femtosecond laser method in cyclic transparent optical polymer (CYTOP) fibers at different angles. Specifically, the gratings were inscribed with 0°, 45° and 90° angle in respect to the core's optical axis. The materials molecular structures are investigated through the Fourier-transform infrared spectroscopy (FTIR) and Raman spectroscopy, which indicate that the changes on the material structure are highly controlled and restricted to the fiber core, as an important benefit of the plane-by-plane inscription method. In order to verify the impact of the grating inscription in the samples' physical properties, thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) are performed. Results show an increase in the degradation temperature in higher inscription angles (90°), whereas there is no significant variation in the polymer glass transition temperature (Tg) between samples. However, the frequency shift on the polymer loss factor monotonically increases with the decrease of the grating angle, i.e., 0° sample shows the largest shift in the loss factor. Regarding the elastic modulus, the 90° inscription angle sample presents the lowest elastic modulus. The results obtained in these analyses provide guidelines on the fabrication and operation limits (in terms of temperature and stress) of POF based devices, including tunable filters and sensors.
ISSN: 0925-3467
DOI: 10.1016/j.optmat.2020.110412
Rights: © Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Federal University of Espírito Santo 
Cyprus University of Technology 
Universidade de Aveiro 
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