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Graphene oxide as a tunable platform for microsphere-based optical fiber sensors

Title
Graphene oxide as a tunable platform for microsphere-based optical fiber sensors
Type
Article in International Conference Proceedings Book
Year
2019
Authors
Monteiro, CS
(Author)
Other
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Raposo, M
(Author)
Other
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Ribeiro, P
(Author)
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Susana Silva
(Author)
FCUP
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Frazao, O
(Author)
FCUP
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Conference proceedings International
4th International Conference on Applications of Optics and Photonics (AOP)
Univ Lisbon, Lisbon, PORTUGAL, MAY 31-JUN 04, 2019
Other information
Authenticus ID: P-00R-8AD
Abstract (EN): Hollow microsphere fiber sensors are Fabry-Perot interferometers ( FPI) that can be used for lateral loading, temperature, and refractive index sensing. In this work, graphene oxide (GO) is explored as a tunable platform for enhancing the spectral properties of hollow microsphere fiber sensors. GO offers similar mechanical and optical properties as graphene, with the advantage of a wider range of deposition methods and a lower cost. The influence of multilayer coatings of polyethylenimine (PEI) and GO, achieved with the layer-by-layer technique, on the reflectivity of the outer surface, and hence, on the spectrum of the FPI for maximum of 30 bilayers was studied. The obtained results revealed a change of the microsphere outer surface reflectivity and also of visibility of the reflected spectrum when varying the number of bilayers. A maximum signal amplitude of 3.9 dB was attained for the 13th bilayer, allowing to conclude that PEI/GO multilayer coatings can be used for enhancing desired properties of the three-wave FPI for different sensing applications.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 5
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